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git: fix zero hash check crash in git/serve

--- a/sys/src/cmd/git/ref.c

+++ b/sys/src/cmd/git/ref.c

@@ -142,7 +142,7 @@

 		unref(o);

 	}		

 	for(i = 0; i < ntail; i++){

-		if(hasheq(&head[i], &Zhash))

+		if(hasheq(&tail[i], &Zhash))

 			continue;

 		if((o = readobject(tail[i])) == nil){

 			werrstr("read tail %H: %r", tail[i]);