omit unnecessary conditions

diff --git a/src/http/modules/ngx_http_dav_module.c b/src/http/modules/ngx_http_dav_module.c
index 2378e36..854627c 100644
--- a/src/http/modules/ngx_http_dav_module.c
+++ b/src/http/modules/ngx_http_dav_module.c

@@ -355,7 +355,7 @@
 
     rc = ngx_http_discard_request_body(r);
 
-    if (rc != NGX_OK && rc != NGX_AGAIN) {
+    if (rc != NGX_OK) {
         return rc;
     }
 
@@ -471,7 +471,7 @@
 
     rc = ngx_http_discard_request_body(r);
 
-    if (rc != NGX_OK && rc != NGX_AGAIN) {
+    if (rc != NGX_OK) {
         return rc;
     }
 
@@ -613,7 +613,7 @@
 
     rc = ngx_http_discard_request_body(r);
 
-    if (rc != NGX_OK && rc != NGX_AGAIN) {
+    if (rc != NGX_OK) {
         return rc;
     }
 

diff --git a/src/http/modules/ngx_http_empty_gif_module.c b/src/http/modules/ngx_http_empty_gif_module.c
index dd9b935..66ada08 100644
--- a/src/http/modules/ngx_http_empty_gif_module.c
+++ b/src/http/modules/ngx_http_empty_gif_module.c

@@ -118,7 +118,7 @@
 
     rc = ngx_http_discard_request_body(r);
 
-    if (rc != NGX_OK && rc != NGX_AGAIN) {
+    if (rc != NGX_OK) {
         return rc;
     }
 

diff --git a/src/http/modules/ngx_http_flv_module.c b/src/http/modules/ngx_http_flv_module.c
index e1bec8b..cc258ea 100644
--- a/src/http/modules/ngx_http_flv_module.c
+++ b/src/http/modules/ngx_http_flv_module.c

@@ -91,7 +91,7 @@
 
     rc = ngx_http_discard_request_body(r);
 
-    if (rc != NGX_OK && rc != NGX_AGAIN) {
+    if (rc != NGX_OK) {
         return rc;
     }
 

diff --git a/src/http/modules/ngx_http_memcached_module.c b/src/http/modules/ngx_http_memcached_module.c
index 1cb8b74..013b5cb 100644
--- a/src/http/modules/ngx_http_memcached_module.c
+++ b/src/http/modules/ngx_http_memcached_module.c

@@ -169,7 +169,7 @@
 
     rc = ngx_http_discard_request_body(r);
 
-    if (rc != NGX_OK && rc != NGX_AGAIN) {
+    if (rc != NGX_OK) {
         return rc;
     }
 

diff --git a/src/http/modules/ngx_http_static_module.c b/src/http/modules/ngx_http_static_module.c
index e074b23..b94ebf2 100644
--- a/src/http/modules/ngx_http_static_module.c
+++ b/src/http/modules/ngx_http_static_module.c

@@ -102,7 +102,7 @@
 
     rc = ngx_http_discard_request_body(r);
 
-    if (rc != NGX_OK && rc != NGX_AGAIN) {
+    if (rc != NGX_OK) {
         return rc;
     }
 

diff --git a/src/http/modules/ngx_http_stub_status_module.c b/src/http/modules/ngx_http_stub_status_module.c
index 10b3937..6cdf851 100644
--- a/src/http/modules/ngx_http_stub_status_module.c
+++ b/src/http/modules/ngx_http_stub_status_module.c

@@ -71,7 +71,7 @@
 
     rc = ngx_http_discard_request_body(r);
 
-    if (rc != NGX_OK && rc != NGX_AGAIN) {
+    if (rc != NGX_OK) {
         return rc;
     }