Fix logged path to match checked path in loader

This is to fix a logged path missed in
8f5c1780706113c926bb7801db27dbae97d00fcf
diff --git a/system/core/Loader.php b/system/core/Loader.php
index 254ad0d..c0a5cd6 100644
--- a/system/core/Loader.php
+++ b/system/core/Loader.php
@@ -1118,7 +1118,7 @@
 				}
 				else
 				{
-					log_message('debug', APPPATH.'libraries/'.$file_path.$subclass.'.php exists, but does not declare '.$subclass);
+    				log_message('debug', $path.' exists, but does not declare '.$subclass);
 				}
 			}
 		}