transport.c: squelch a gcc 4.0.1 complaint about an uninitialized variable

The variable is always set if it is going to be used; gcc just does
not notice it.

Signed-off-by: Blake Ramsdell <blaker@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

transport.c

@@ -107,7 +107,7 @@ static void insert_packed_refs(const char *packed_refs, struct ref **list)
 		return;
 
 	for (;;) {
-		int cmp, len;
+		int cmp = cmp, len;
 
 		if (!fgets(buffer, sizeof(buffer), f)) {
 			fclose(f);