nb/intel: Use "if (!ptr)" in preference to "if (ptr == NULL)"

Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Change-Id: I6d0d945011fa046b974c6f4554cb9fb15e523afb
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67578
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/intel/i945/northbridge.c b/src/northbridge/intel/i945/northbridge.c
index 5524b31..12debb2 100644
--- a/src/northbridge/intel/i945/northbridge.c
+++ b/src/northbridge/intel/i945/northbridge.c
@@ -116,7 +116,7 @@
 {
 	struct device *dev = pcidev_on_root(0, 0);
 
-	if (dev == NULL)
+	if (!dev)
 		die("could not find pci 00:00.0!\n");
 
 	pci_write_config8(dev, SMRAM, smram);