drm/radeon: pass drm dev radeon_agp_head_init directly

Pass drm dev directly as rdev->ddev gets initialized later on
at radeon_device_init().

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=214375
Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

drivers/gpu/drm/radeon/radeon_kms.c

@@ -119,7 +119,7 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
 #endif
 
 	if (pci_find_capability(pdev, PCI_CAP_ID_AGP))
-		rdev->agp = radeon_agp_head_init(rdev->ddev);
+		rdev->agp = radeon_agp_head_init(dev);
 	if (rdev->agp) {
 		rdev->agp->agp_mtrr = arch_phys_wc_add(
 			rdev->agp->agp_info.aper_base,