remove tests of always-false condition

* fsck.c (fsck_error_function): Don't test obj->sha1 == 0.
It can never be true, since that sha1 member is an array.
* transport.c (set_upstreams): Likewise for ref->new_sha1.

Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

fsck.c

@@ -350,7 +350,7 @@ int fsck_error_function(struct object *obj, int type, const char *fmt, ...)
 	int len;
 	struct strbuf sb = STRBUF_INIT;
 
-	strbuf_addf(&sb, "object %s:", obj->sha1?sha1_to_hex(obj->sha1):"(null)");
+	strbuf_addf(&sb, "object %s:", sha1_to_hex(obj->sha1));
 
 	va_start(ap, fmt);
 	len = vsnprintf(sb.buf + sb.len, strbuf_avail(&sb), fmt, ap);

transport.c

@@ -156,7 +156,7 @@ static void set_upstreams(struct transport *transport, struct ref *refs,
 			continue;
 		if (!ref->peer_ref)
 			continue;
-		if (!ref->new_sha1 || is_null_sha1(ref->new_sha1))
+		if (is_null_sha1(ref->new_sha1))
 			continue;
 
 		/* Follow symbolic refs (mainly for HEAD). */