scsi: mpt3sas: Fix a fw_event memory leak

scsi: mpt3sas: Fix a fw_event memory leak

[ Upstream commit 3e90b38781e3bdd651edaf789585687611638862 ]

In _mpt3sas_fw_work() the fw_event reference is removed, it should also
be freed in all cases.

Fixes: 4318c7347847 ("scsi: mpt3sas: Handle NVMe PCIe device related events generated from firmware.")
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Link: https://lore.kernel.org/r/20250723153018.50518-1-thenzl@redhat.com
Acked-by: Sathya Prakash Veerichetty <sathya.prakash@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>