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In idpf_vc_core_init, the mailbox work is queued
on a mailbox workqueue but it is not cancelled on error.
This results in a call trace when idpf_mbx_task tries
to access the freed mailbox queue pointer. Fix it by
cancelling the mailbox work in the error path.

Fixes: 4930fbf4

 ("idpf: add core init and interrupt request")
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Tested-by: Krishneil Singh  <krishneil.k.singh@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20231023202655.173369-3-jacob.e.keller@intel.com

Signed-off-by: Jakub Kicinski <kuba@kernel.org>