Use ngx_calloc_buf() where appropriate.

diff --git a/src/http/modules/ngx_http_flv_module.c b/src/http/modules/ngx_http_flv_module.c
index cc25320..7b72fae 100644
--- a/src/http/modules/ngx_http_flv_module.c
+++ b/src/http/modules/ngx_http_flv_module.c

@@ -203,7 +203,7 @@
     }
 
     if (i == 0) {
-        b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+        b = ngx_calloc_buf(r->pool);
         if (b == NULL) {
             return NGX_HTTP_INTERNAL_SERVER_ERROR;
         }
@@ -217,7 +217,7 @@
     }
 
 
-    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         return NGX_HTTP_INTERNAL_SERVER_ERROR;
     }

diff --git a/src/http/modules/ngx_http_gzip_filter_module.c b/src/http/modules/ngx_http_gzip_filter_module.c
index f9652d0..287fd36 100644
--- a/src/http/modules/ngx_http_gzip_filter_module.c
+++ b/src/http/modules/ngx_http_gzip_filter_module.c

@@ -644,7 +644,7 @@
     static u_char  gzheader[10] =
                                { 0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 3 };
 
-    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         return NGX_ERROR;
     }

diff --git a/src/http/modules/ngx_http_gzip_static_module.c b/src/http/modules/ngx_http_gzip_static_module.c
index b9294dd..1d87cd4 100644
--- a/src/http/modules/ngx_http_gzip_static_module.c
+++ b/src/http/modules/ngx_http_gzip_static_module.c

@@ -248,7 +248,7 @@
 
     /* we need to allocate all before the header would be sent */
 
-    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         return NGX_HTTP_INTERNAL_SERVER_ERROR;
     }

diff --git a/src/http/modules/ngx_http_image_filter_module.c b/src/http/modules/ngx_http_image_filter_module.c
index dbec5d8..6c03e8a 100644
--- a/src/http/modules/ngx_http_image_filter_module.c
+++ b/src/http/modules/ngx_http_image_filter_module.c

@@ -581,7 +581,7 @@
     size_t      len;
     ngx_buf_t  *b;
 
-    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         return NULL;
     }
@@ -633,7 +633,7 @@
 {
     ngx_buf_t  *b;
 
-    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         return NULL;
     }
@@ -1067,7 +1067,7 @@
         return NULL;
     }
 
-    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         gdFree(out);
         return NULL;

diff --git a/src/http/modules/ngx_http_mp4_module.c b/src/http/modules/ngx_http_mp4_module.c
index f3c0fdd..08a68d0 100644
--- a/src/http/modules/ngx_http_mp4_module.c
+++ b/src/http/modules/ngx_http_mp4_module.c

@@ -636,7 +636,7 @@
     }
 
     if (mp4 == NULL) {
-        b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+        b = ngx_calloc_buf(r->pool);
         if (b == NULL) {
             return NGX_HTTP_INTERNAL_SERVER_ERROR;
         }

diff --git a/src/http/modules/ngx_http_static_module.c b/src/http/modules/ngx_http_static_module.c
index f2435a7..b0513be 100644
--- a/src/http/modules/ngx_http_static_module.c
+++ b/src/http/modules/ngx_http_static_module.c

@@ -233,7 +233,7 @@
 
     /* we need to allocate all before the header would be sent */
 
-    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         return NGX_HTTP_INTERNAL_SERVER_ERROR;
     }

diff --git a/src/http/modules/ngx_http_xslt_filter_module.c b/src/http/modules/ngx_http_xslt_filter_module.c
index 695f3bf..fae5895 100644
--- a/src/http/modules/ngx_http_xslt_filter_module.c
+++ b/src/http/modules/ngx_http_xslt_filter_module.c

@@ -584,7 +584,7 @@
         return NULL;
     }
 
-    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         ngx_free(buf);
         return NULL;

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 292671d..38df6ac 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c

@@ -1926,7 +1926,7 @@
         return ngx_http_send_header(r);
     }
 
-    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         return NGX_HTTP_INTERNAL_SERVER_ERROR;
     }

diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
index 8c75f95..b635b35 100644
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c

@@ -1577,7 +1577,7 @@
 
     /* we need to allocate all before the header would be sent */
 
-    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         return NGX_HTTP_INTERNAL_SERVER_ERROR;
     }