grep --no-index: honor pathspecs correctly

Even though fill_directory() takes pathspec, the returned set of paths
is not guaranteed to be free of paths outside the pathspec. Perhaps we
would need to change that, but the current API is that the caller needs
to further filter them.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/grep.c

@@ -626,6 +626,10 @@ static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec)
 
 	fill_directory(&dir, pathspec->raw);
 	for (i = 0; i < dir.nr; i++) {
+		const char *name = dir.entries[i]->name;
+		int namelen = strlen(name);
+		if (!match_pathspec_depth(pathspec, name, namelen, 0, NULL))
+			continue;
 		hit |= grep_file(opt, dir.entries[i]->name);
 		if (hit && opt->status_only)
 			break;