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git/serve: don't return spurious error, pick best index for new HEAD

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

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

@@ -497,7 +497,7 @@

 			snprint(buf, sizeof(buf), "open HEAD: %r");

 			goto error;

 		}

-		if(fprint(fd, "ref: %s", ref[0]) == -1){

+		if(fprint(fd, "ref: %s", ref[newidx]) == -1){

 			snprint(buf, sizeof(buf), "write HEAD ref: %r");

 			goto error;

 		}

@@ -505,7 +505,8 @@

 	}

 	ret = 0;

 error:

-	fmtpkt(c, "ERR %s", buf);

+	if(ret != 0)

+		fmtpkt(c, "ERR %s", buf);

 	close(lockfd);

 	werrstr(buf);

 	return ret;

-- 

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