fix small bug introduced while cleaning up compiler warnings

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@153618 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_musiconhold.c

@@ -941,7 +941,7 @@ static int moh_scan_files(struct mohclass *class) {
 		ast_log(LOG_WARNING, "getcwd() failed: %s\n", strerror(errno));
 		return -1;
 	}
-	if (chdir(path) < 0) {
+	if (chdir(dir_path) < 0) {
 		ast_log(LOG_WARNING, "chdir() failed: %s\n", strerror(errno));
 		return -1;
 	}