Merge branch 'eg/add-uflags'

Code clean-up practice.

* eg/add-uflags:
  add: use unsigned type for collection of bits

builtin/add.c

@@ -115,7 +115,7 @@ static int refresh(int verbose, const struct pathspec *pathspec)
 	int i, ret = 0;
 	char *skip_worktree_seen = NULL;
 	struct string_list only_match_skip_worktree = STRING_LIST_INIT_NODUP;
-	int flags = REFRESH_IGNORE_SKIP_WORKTREE |
+	unsigned int flags = REFRESH_IGNORE_SKIP_WORKTREE |
 		    (verbose ? REFRESH_IN_PORCELAIN : REFRESH_QUIET);
 
 	seen = xcalloc(pathspec->nr, 1);