fix error introduced in r1273 and r1275:
nginx did not process FastCGI response if header was at end of FastCGI record
diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c
index 5678e21..17e8a3d 100644
--- a/src/http/modules/ngx_http_fastcgi_module.c
+++ b/src/http/modules/ngx_http_fastcgi_module.c
@@ -1232,7 +1232,7 @@
         }
 
         if (rc == NGX_OK) {
-            return NGX_AGAIN;
+            continue;
         }
 
         /* rc == NGX_AGAIN */