Prevent trying to handle uninitialised memory as a string.

diff --git a/loader/module.c b/loader/module.c
index b49e28b..c8f716d 100644
--- a/loader/module.c
+++ b/loader/module.c
@@ -1379,6 +1379,7 @@
 
 	filename = HeapAlloc ( GetProcessHeap(), 0, MAX_PATH + 1 );
 	if ( !filename ) return NULL;
+        *filename = 0; /* Just in case we don't set it before goto error */
 
         RtlAcquirePebLock();