[PATCH 06/12] drm: fix __alpha__ PCI lookup

[David Herrmann <dh.herrmann@gmail.com>]

Testing the return value of list_entry() for NULL is a no-op (as it is
just a fancy container_of() / offsetof()). Drop the superfluous if-clause
and instead verify the actual root-node is available. This is probably
what it was meant to test for from the beginning, anyway.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
---
 drivers/gpu/drm/drm_fops.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index a402061..afba0bf 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -330,11 +330,11 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
 			dev->hose = pci_dev->sysdata;
 			pci_dev_put(pci_dev);
 		}
-		if (!dev->hose) {
+
+		if (!dev->hose && pci_root_buses.next) {
 			struct pci_bus *b = list_entry(pci_root_buses.next,
-				struct pci_bus, node);
-			if (b)
-				dev->hose = b->sysdata;
+						       struct pci_bus, node);
+			dev->hose = b->sysdata;
 		}
 	}
 #endif
-- 
2.0.2