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git/serve: support thin packs

Git push defaults to thin packs, so we
may as well honor them.

--- a/pack.c

+++ b/pack.c

@@ -368,7 +368,7 @@

 	o->len = Boffset(f) - o->off;

 	if(d == nil || n != nd)

 		goto error;

-	if((b = readidxobject(f, h, flag)) == nil)

+	if((b = readidxobject(f, h, flag & ~Cidx)) == nil)

 		goto error;

 	if(applydelta(o, b, d, n) == -1)

 		goto error;

--- a/serve.c

+++ b/serve.c

@@ -384,7 +384,7 @@

 	if(recvnegotiate(c, &cur, &upd, &ref, &nupd) == -1)

 		sysfatal("negotiate refs: %r");

-	if(nupd != 0 && updatepack(c) == 0)

+	if(nupd != 0 && updatepack(c) == -1)

 		sysfatal("update pack: %r");

 	if(nupd != 0 && updaterefs(c, cur, upd, ref, nupd) == -1)

 		sysfatal("update refs: %r");