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git/serve: report when a repo does not exist

We were erroring out on the server, but never sending
the error to the client. The client instead got an empty
pack file and assumed that it just got an empty repository.

--- a/serve.c

+++ b/serve.c

@@ -98,7 +98,7 @@

 	while(1){

 		if((n = readpkt(c, pkt, sizeof(pkt))) == -1)

 			goto error;

-		if(strncmp(pkt, "done") == 0)

+		if(strncmp(pkt, "done", 4) == 0)

 			break;

 		if(n == 0){

 			if(!acked && fmtpkt(c, "NAK") == -1)

@@ -499,8 +499,10 @@

 	cleanname(repo);

 	if(strncmp(repo, "../", 3) == 0)

 		sysfatal("invalid path %s\n", repo);

-	if(bind(repo, "/", MREPL) == -1)

+	if(bind(repo, "/", MREPL) == -1){

+		fmtpkt(&c, "ERR no repo %r\n");

 		sysfatal("enter %s: %r", repo);

+	}

 	if(chdir("/") == -1)

 		sysfatal("chdir: %r");

 	if(access(".git", AREAD) == -1)