drm/amdgpu: return an error if query_video_caps is not set

Should only be an issue for bring up when the function
pointer is not set, but check it anyway to be safe.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c

@@ -1102,6 +1102,9 @@ int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 		struct drm_amdgpu_info_video_caps *caps;
 		int r;
 
+		if (!adev->asic_funcs->query_video_codecs)
+			return -EINVAL;
+
 		switch (info->video_cap.type) {
 		case AMDGPU_INFO_VIDEO_CAPS_DECODE:
 			r = amdgpu_asic_query_video_codecs(adev, false, &codecs);