Merge branch 'jk/fetch-pack-fsck-wo-lock-pack'

"git fetch-pack -k -k" without passing "--lock-pack" (which we
never do ourselves) did not work at all, which has been corrected.

* jk/fetch-pack-fsck-wo-lock-pack:
  fetch-pack: fix segfault when fscking without --lock-pack

fetch-pack.c

@@ -1038,8 +1038,10 @@ static int get_pack(struct fetch_pack_args *args,
 
 		if (!is_well_formed)
 			die(_("fetch-pack: invalid index-pack output"));
-		if (pack_lockfile)
+		if (pack_lockfiles && pack_lockfile)
 			string_list_append_nodup(pack_lockfiles, pack_lockfile);
+		else
+			free(pack_lockfile);
 		parse_gitmodules_oids(cmd.out, gitmodules_oids);
 		close(cmd.out);
 	}