drm/radeon/kms: r600/r700 don't test ib if ib initialization fails

If ib initialization failed don't try to test ib as it will result
in an oops (accessing NULL ib buffer ptr).
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/gpu/drm/radeon/r600.c

@@ -2064,15 +2064,16 @@ int r600_init(struct radeon_device *rdev)
 	if (rdev->accel_working) {
 		r = radeon_ib_pool_init(rdev);
 		if (r) {
-			DRM_ERROR("radeon: failed initializing IB pool (%d).\n", r);
+			dev_err(rdev->dev, "IB initialization failed (%d).\n", r);
 			rdev->accel_working = false;
-		}
+		} else {
 			r = r600_ib_test(rdev);
 			if (r) {
-			DRM_ERROR("radeon: failed testing IB (%d).\n", r);
+				dev_err(rdev->dev, "IB test failed (%d).\n", r);
 				rdev->accel_working = false;
 			}
 		}
+	}
 
 	r = r600_audio_init(rdev);
 	if (r)

drivers/gpu/drm/radeon/rv770.c

@@ -1075,15 +1075,16 @@ int rv770_init(struct radeon_device *rdev)
 	if (rdev->accel_working) {
 		r = radeon_ib_pool_init(rdev);
 		if (r) {
-			DRM_ERROR("radeon: failed initializing IB pool (%d).\n", r);
+			dev_err(rdev->dev, "IB initialization failed (%d).\n", r);
 			rdev->accel_working = false;
-		}
+		} else {
 			r = r600_ib_test(rdev);
 			if (r) {
-			DRM_ERROR("radeon: failed testing IB (%d).\n", r);
+				dev_err(rdev->dev, "IB test failed (%d).\n", r);
 				rdev->accel_working = false;
 			}
 		}
+	}
 	return 0;
 }