removing error_log in favour of E_USER_WARNING

Author: daniel-sc

src/Flow/Mongo/MongoFile.php

@@ -98,7 +98,7 @@ public function saveChunk()
 
             return true;
         } catch (\Exception $e) {
-            error_log("Could not store chunk: " . $e->getMessage() . "\n" . $e->getTraceAsString());
+            trigger_error("Could not store chunk: " . $e->getMessage() . "\n" . $e->getTraceAsString(), E_USER_WARNING);
             try {
                 if (isset($chunkQuery)) {
                     $this->config->getGridFs()->chunks->remove($chunkQuery);
@@ -182,4 +182,4 @@ protected function getGridFsFileQuery()
             'length' => intval($this->request->getTotalSize())
         ];
     }
-}
+}