drm/msm/dpu: Fix error pointers in dpu_plane_virtual_atomic_check

The function dpu_plane_virtual_atomic_check was dereferencing pointers
returned by drm_atomic_get_plane_state without checking for errors. This
could lead to undefined behavior if the function returns an error pointer.

This commit adds checks using IS_ERR to ensure that plane_state is
valid before dereferencing them.

Similar to commit da29abe71e16
("drm/amd/display: Fix error pointers in amdgpu_dm_crtc_mem_type_changed").

Fixes: 774bcfb73176 ("drm/msm/dpu: add support for virtual planes")
Signed-off-by: Chenyuan Yang <[e-mail]>
Reviewed-by: Dmitry Baryshkov <[e-mail]>
Reviewed-by: Abhinav Kumar <[e-mail]>
Patchwork: https://patchwork.freedesktop.org/patch/643132/
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Abhinav Kumar <[e-mail]>

drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c

···
 	struct drm_crtc_state *crtc_state;
 	int ret;
 
+	if (IS_ERR(plane_state))
+		return PTR_ERR(plane_state);
+
 	if (plane_state->crtc)
 		crtc_state = drm_atomic_get_new_crtc_state(state,
 							   plane_state->crtc);