Revert "drm/amdgpu: validate user pitch alignment"

The check turned out to be too strict in some cases.

Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Michel Dänzer <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	struct drm_gem_object *obj;
 	struct amdgpu_framebuffer *amdgpu_fb;
 	int ret;
-	struct amdgpu_device *adev = dev->dev_private;
-	int cpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0);
-	int pitch = mode_cmd->pitches[0] / cpp;
-
-	pitch = amdgpu_align_pitch(adev, pitch, cpp, false);
-	if (mode_cmd->pitches[0] != pitch) {
-		DRM_DEBUG_KMS("Invalid pitch: expecting %d but got %d\n",
-			      pitch, mode_cmd->pitches[0]);
-		return ERR_PTR(-EINVAL);
-	}
 
 	obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]);
 	if (obj ==  NULL) {