Dav: added checks for chunked to body presence conditions.

These checks were missed when chunked support was introduced.  And also
added an explicit error message to ngx_http_dav_copy_move_handler()
(it was missed for some reason, in contrast to DELETE and MKCOL handlers).

src/http/modules/ngx_http_dav_module.c

diff --git a/src/http/modules/ngx_http_dav_module.c b/src/http/modules/ngx_http_dav_module.c
index 59ad2ce..8b69e6f 100644
--- a/src/http/modules/ngx_http_dav_module.c
+++ b/src/http/modules/ngx_http_dav_module.c
@@ -312,7 +312,7 @@
     ngx_file_info_t           fi;
     ngx_http_dav_loc_conf_t  *dlcf;
 
-    if (r->headers_in.content_length_n > 0) {
+    if (r->headers_in.content_length_n > 0 || r->headers_in.chunked) {
         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                       "DELETE with body is unsupported");
         return NGX_HTTP_UNSUPPORTED_MEDIA_TYPE;
@@ -495,7 +495,7 @@
     size_t     root;
     ngx_str_t  path;
 
-    if (r->headers_in.content_length_n > 0) {
+    if (r->headers_in.content_length_n > 0 || r->headers_in.chunked) {
         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                       "MKCOL with body is unsupported");
         return NGX_HTTP_UNSUPPORTED_MEDIA_TYPE;
@@ -549,7 +549,9 @@
     ngx_http_dav_copy_ctx_t   copy;
     ngx_http_dav_loc_conf_t  *dlcf;
 
-    if (r->headers_in.content_length_n > 0) {
+    if (r->headers_in.content_length_n > 0 || r->headers_in.chunked) {
+        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+                      "COPY and MOVE with body are unsupported");
         return NGX_HTTP_UNSUPPORTED_MEDIA_TYPE;
     }