mapper: fix potential crash in file permission check

NEWS

@@ -10,6 +10,7 @@ ver 0.17.2 (2012/??/??)
   - httpd: use monotonic clock, avoid hiccups after system clock adjustment
   - httpd: fix throttling bug after resuming playback
 * mapper: fix non-UTF8 music directory name
+* mapper: fix potential crash in file permission check
 
 
 ver 0.17.1 (2012/07/31)

src/mapper.c

@@ -93,10 +93,10 @@ check_directory(const char *path)
 #endif
 
 	DIR *dir = opendir(path);
-	if (dir == NULL && errno == EACCES)
-		g_warning("No permission to read directory: %s", path);
-	else
+	if (dir != NULL)
 		closedir(dir);
+	else if (errno == EACCES)
+		g_warning("No permission to read directory: %s", path);
 }
 
 static void