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: Kim Lilliestierna <kim.xx.lilliestierna@stericsson.com>
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/caif/caif_hsi.c b/drivers/net/caif/caif_hsi.c
index f81f61f..56cc941 100644
--- a/drivers/net/caif/caif_hsi.c
+++ b/drivers/net/caif/caif_hsi.c
@@ -115,7 +115,7 @@
 {
 	int i;
 
-	if (cfhsi->aggregation_timeout < 0)
+	if (cfhsi->aggregation_timeout == 0)
 		return true;
 
 	for (i = 0; i < CFHSI_PRIO_BEBK; ++i) {