Exclude: Add a missing free in case of empty lines.

This fixes Coverity CLT 12893

csync/src/csync_exclude.c

@@ -229,6 +229,7 @@ CSYNC_EXCLUDE_TYPE csync_excluded(CSYNC *ctx, const char *path, int filetype) {
 
       type = CSYNC_FILE_EXCLUDE_LIST;
       if (strlen(pattern) < 1) {
+	  SAFE_FREE(pattern_stored);
           continue;
       }
       /* Ecludes starting with ']' means it can be cleanup */