CVE-2024-24863 NULL pointer deference in __drm_atomic_helper_connector_destroy_state in drm/arm/malidp of Linux kernel

In malidp_mw_connector_reset, new memory is allocated with kzalloc, but
no check is performed. In order to prevent null pointer dereferencing,
ensure that mw_state is checked before calling
__drm_atomic_helper_connector_reset.