caif-hsi: changed test on aggregation_timeout

Aggregation_timeout is an unsigned long,
a test for less than zero can never become true,
compare with zero instead.
Signed-off-by: NKim Lilliestierna <kim.xx.lilliestierna@stericsson.com>
Signed-off-by: NSjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/caif/caif_hsi.c

@@ -115,7 +115,7 @@ static bool cfhsi_can_send_aggregate(struct cfhsi *cfhsi)
 {
 	int i;
 
-	if (cfhsi->aggregation_timeout < 0)
+	if (cfhsi->aggregation_timeout == 0)
 		return true;
 
 	for (i = 0; i < CFHSI_PRIO_BEBK; ++i) {