Fixed memory leak on response body sending failure.

src/nxt_http.h

@@ -176,7 +176,6 @@ nxt_buf_t *nxt_http_buf_mem(nxt_task_t *task, nxt_http_request_t *r,
     size_t size);
 nxt_buf_t *nxt_http_buf_last(nxt_http_request_t *r);
 void nxt_http_request_error_handler(nxt_task_t *task, void *obj, void *data);
-void nxt_http_request_close_handler(nxt_task_t *task, void *obj, void *data);
 
 nxt_int_t nxt_http_request_host(void *ctx, nxt_http_field_t *field,
     uintptr_t data);

src/nxt_http_request.c

@@ -13,6 +13,8 @@ static void nxt_http_app_request(nxt_task_t *task, void *obj, void *data);
 static void nxt_http_request_mem_buf_completion(nxt_task_t *task, void *obj,
     void *data);
 static void nxt_http_request_done(nxt_task_t *task, void *obj, void *data);
+static void nxt_http_request_close_handler(nxt_task_t *task, void *obj,
+    void *data);
 
 static u_char *nxt_http_date(u_char *buf, nxt_realtime_t *now, struct tm *tm,
     size_t size, const char *format);
@@ -449,7 +451,7 @@ nxt_http_request_error_handler(nxt_task_t *task, void *obj, void *data)
 }
 
 
-void
+static void
 nxt_http_request_close_handler(nxt_task_t *task, void *obj, void *data)
 {
     nxt_http_proto_t         proto;

src/nxt_router.c

@@ -3500,7 +3500,7 @@ static const nxt_http_request_state_t  nxt_http_request_send_state
     nxt_aligned(64) =
 {
     .ready_handler = nxt_http_request_send_body,
-    .error_handler = nxt_http_request_close_handler,
+    .error_handler = nxt_http_request_error_handler,
 };