clean: use cache_name_is_other()

cmd_clean() has the exact same code of index_name_is_other(). Reduce
code duplication.
Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin/clean.c

@@ -933,29 +933,12 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
 
 	for (i = 0; i < dir.nr; i++) {
 		struct dir_entry *ent = dir.entries[i];
-		int len, pos;
 		int matches = 0;
-		const struct cache_entry *ce;
 		struct stat st;
 		const char *rel;
 
-		/*
-		 * Remove the '/' at the end that directory
-		 * walking adds for directory entries.
-		 */
-		len = ent->len;
-		if (len && ent->name[len-1] == '/')
-			len--;
-		pos = cache_name_pos(ent->name, len);
-		if (0 <= pos)
-			continue;	/* exact match */
-		pos = -pos - 1;
-		if (pos < active_nr) {
-			ce = active_cache[pos];
-			if (ce_namelen(ce) == len &&
-			    !memcmp(ce->name, ent->name, len))
-				continue; /* Yup, this one exists unmerged */
-		}
+		if (!cache_name_is_other(ent->name, ent->len))
+			continue;
 
 		if (lstat(ent->name, &st))
 			die_errno("Cannot lstat '%s'", ent->name);