Don't die in git-http-fetch when fetching packs.

My sp/mmap changes to pack-check.c modified the function such that
it expects packed_git.pack_size to be populated with the total
bytecount of the packfile by the caller.

But that isn't the case for packs obtained by git-http-fetch as
pack_size was not initialized before being accessed.  This caused
verify_pack to think it had 2^32-21 bytes available when the
downloaded pack perhaps was only 305 bytes in length.  The use_pack
function then later dies with "offset beyond end of packfile"
when computing the overall file checksum.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

http-fetch.c

@@ -809,6 +809,7 @@ static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
 		return error("Unable to start request");
 	}
 
+	target->pack_size = ftell(packfile);
 	fclose(packfile);
 
 	ret = move_temp_to_file(tmpfile, filename);

http-push.c

@@ -770,11 +770,14 @@ static void finish_request(struct transfer_request *request)
 				request->url, curl_errorstr);
 			remote->can_update_info_refs = 0;
 		} else {
+			off_t pack_size = ftell(request->local_stream);
+
 			fclose(request->local_stream);
 			request->local_stream = NULL;
 			if (!move_temp_to_file(request->tmpfile,
 					       request->filename)) {
 				target = (struct packed_git *)request->userData;
+				target->pack_size = pack_size;
 				lst = &remote->packs;
 				while (*lst != target)
 					lst = &((*lst)->next);