scsi: mpt3sas: Drop unused variable in mpt3sas_send_mctp_passthru_req()

JIRA: https://issues.redhat.com/browse/RHEL-101342

With W=1, gcc complains correctly:

    mpt3sas_ctl.c: In function ‘mpt3sas_send_mctp_passthru_req’:
    mpt3sas_ctl.c:2917:29: error: variable ‘mpi_reply’ set but not used [-Werror=unused-but-set-variable]
     2917 |         MPI2DefaultReply_t *mpi_reply;
          |                             ^~~~~~~~~

Drop the unused assignment and variable.

Signed-off-by: André Draszik <andre.draszik@linaro.org>
Link: https://lore.kernel.org/r/20250606-mpt3sas-v1-1-906ffe49fb6b@linaro.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 0ec996e)
Signed-off-by: Chandrakanth Patil <chanpati@redhat.com>

Author: Chandrakanth Patil

drivers/scsi/mpt3sas/mpt3sas_ctl.c

@@ -2914,7 +2914,6 @@ int mpt3sas_send_mctp_passthru_req(struct mpt3_passthru_command *command)
 {
 	struct MPT3SAS_ADAPTER *ioc;
 	MPI2RequestHeader_t *mpi_request = NULL, *request;
-	MPI2DefaultReply_t *mpi_reply;
 	Mpi26MctpPassthroughRequest_t *mctp_passthru_req;
 	u16 smid;
 	unsigned long timeout;
@@ -3022,8 +3021,6 @@ int mpt3sas_send_mctp_passthru_req(struct mpt3_passthru_command *command)
 		goto issue_host_reset;
 	}
 
-	mpi_reply = ioc->ctl_cmds.reply;
-
 	/* copy out xdata to user */
 	if (data_in_sz)
 		memcpy(command->data_in_buf_ptr, data_in, data_in_sz);