Catch invalid --depth option passed to clone or fetch

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

transport.c

@@ -472,8 +472,12 @@ static int set_git_option(struct git_transport_options *opts,
 	} else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 		if (!value)
 			opts->depth = 0;
-		else
+		else {
-			opts->depth = atoi(value);
+			char *end;
+			opts->depth = strtol(value, &end, 0);
+			if (*end)
+				die("transport: invalid depth option '%s'", value);
+		}
 		return 0;
 	}
 	return 1;