statedb.c: fix potential memory leak on win32

This fixes coverity issue 12898

csync/src/csync_statedb.c

@@ -69,12 +69,13 @@ static void _csync_win32_hide_file( const char *file ) {
   fileName = c_utf8_to_locale( file );
   dwAttrs = GetFileAttributesW(fileName);
 
-  if (dwAttrs==INVALID_FILE_ATTRIBUTES) return;
+  if (dwAttrs==INVALID_FILE_ATTRIBUTES) goto cleanup;
 
   if (!(dwAttrs & FILE_ATTRIBUTE_HIDDEN)) {
      SetFileAttributesW(fileName, dwAttrs | FILE_ATTRIBUTE_HIDDEN );
   }
 
+cleanup:
   c_free_locale_string(fileName);
 #else
     (void) file;