[PATCH 5.4/5.10 0/1] drm/atomic: Don't pollute crtc_state->mode_blob with error pointers

[Fedor Pchelkin]

general protection fault in drm_mode_object_put() is hit on 5.4/5.10 if
drm_property_create_blob() fails for some reason and state->mode_blob is
assigned an error pointer which is not treated correctly in some places as
mentioned in patch description.

The following patch fixes the issue and can be cleanly applied to 5.4/5.10
stable branches.

Seems the patch could not be initially backported due to DRM_DEBUG_ATOMIC
-> drm_dbg_atomic() change.