scsi: mpt3sas: Fix _ctl_get_mpt_mctp_passthru_adapter() to return IOC pointer

Fix _ctl_get_mpt_mctp_passthru_adapter() to return the correct IOC
pointer to caller based on dev_index.

Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Link: https://lore.kernel.org/r/1747213781-31545-1-git-send-email-shivasharan.srikanteshwara@broadcom.com


Fixes: c72be4b5 ("scsi: mpt3sas: Add support for MCTP Passthrough commands")
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>