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git/serve: fix uninitialized free

--- a/serve.c

+++ b/serve.c

@@ -32,10 +32,11 @@

 	ret = -1;

 	nrefs = 0;

-	if(resolveref(&head, "HEAD") != -1) {

+	refs = nil;

+	names = nil;

+	if(resolveref(&head, "HEAD") != -1)

 		if(fmtpkt(c, "%H HEAD", head) == -1)

 			goto error;

-	}

 	if((nrefs = listrefs(&refs, &names)) == -1)

 		sysfatal("listrefs: %r");