Bluetooth: Fix minor coding style issue in smp.c

The convention for checking for NULL pointers is !ptr and not
ptr == NULL. This patch fixes such an occurrence in smp.c.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index a7b973b..7435940 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -356,7 +356,7 @@
 	uint8_t tmp[16], data[16];
 	int err;
 
-	if (tfm == NULL) {
+	if (!tfm) {
 		BT_ERR("tfm %p", tfm);
 		return -EINVAL;
 	}