transport-helper.c: fix check for (size_t < 0)

'bytes' is of type size_t which is unsigned thus can't be negative.  But
the assigned write() returns ssize_t, and -1 on error.

For testing < 0, 'bytes' needs to be of a signed type.

Signed-off-by: Nicolas Kaiser <nikai@nikai.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

transport-helper.c

@@ -973,7 +973,7 @@ static int udt_do_read(struct unidirectional_transfer *t)
  */
 static int udt_do_write(struct unidirectional_transfer *t)
 {
-	size_t bytes;
+	ssize_t bytes;
 
 	if (t->bufuse == 0)
 		return 0;	/* Nothing to write. */