zink: fix crash in lower_pv_mode_gs_store
What does this MR do and why?
zink: fix crash in lower_pv_mode_gs_store
src->parent can be null
Fixes: 39770c65 ("zink: fix store subsitution in lower_pv_mode_gs_store
")
zink: fix crash in lower_pv_mode_gs_store
src->parent can be null
Fixes: 39770c65 ("zink: fix store subsitution in lower_pv_mode_gs_store
")