drm: rip out drm_core_has_AGP

Most place actually want to just check for dev->agp (most do, but a
few don't so this fixes a few potential NULL derefs). The only
exception is the agp init code which should check for the AGP driver
feature flag.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index d3875e3..626e9cf 100644
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -264,7 +264,7 @@
 
 static void drm_pci_agp_init(struct drm_device *dev)
 {
-	if (drm_core_has_AGP(dev)) {
+	if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
 		if (drm_pci_device_is_agp(dev))
 			dev->agp = drm_agp_init(dev);
 		if (dev->agp) {
@@ -278,7 +278,7 @@
 
 static void drm_pci_agp_destroy(struct drm_device *dev)
 {
-	if (drm_core_has_AGP(dev) && dev->agp) {
+	if (dev->agp) {
 		arch_phys_wc_del(dev->agp->agp_mtrr);
 		drm_agp_clear(dev);
 		drm_agp_destroy(dev->agp);