scsi: mpt3sas: Fix a locking bug in an error path

scsi: mpt3sas: Fix a locking bug in an error path

Call mutex_unlock(&ioc->hostdiag_unlock_mutex) once from error paths
instead of twice.

This patch fixes the following Clang -Wthread-safety errors:

drivers/scsi/mpt3sas/mpt3sas_base.c:8085:2: error: mutex 'ioc->hostdiag_unlock_mutex' is not held on every path through here [-Werror,-Wthread-safety-analysis]
 8085 |         pci_cfg_access_unlock(ioc->pdev);
      |         ^
drivers/scsi/mpt3sas/mpt3sas_base.c:8019:2: note: mutex acquired here
 8019 |         mutex_lock(&ioc->hostdiag_unlock_mutex);
      |         ^
./include/linux/mutex.h:171:26: note: expanded from macro 'mutex_lock'
  171 | #define mutex_lock(lock) mutex_lock_nested(lock, 0)
      |                          ^
drivers/scsi/mpt3sas/mpt3sas_base.c:8085:2: error: mutex 'ioc->hostdiag_unlock_mutex' is not held on every path through here [-Werror,-Wthread-safety-analysis]
 8085 |         pci_cfg_access_unlock(ioc->pdev);
      |         ^
drivers/scsi/mpt3sas/mpt3sas_base.c:8019:2: note: mutex acquired here
 8019 |         mutex_lock(&ioc->hostdiag_unlock_mutex);
      |         ^
./include/linux/mutex.h:171:26: note: expanded from macro 'mutex_lock'
  171 | #define mutex_lock(lock) mutex_lock_nested(lock, 0)
      |                          ^
drivers/scsi/mpt3sas/mpt3sas_base.c:8087:2: error: releasing mutex 'ioc->hostdiag_unlock_mutex' that was not held [-Werror,-Wthread-safety-analysis]
 8087 |         mutex_unlock(&ioc->hostdiag_unlock_mutex);
      |         ^

Cc: Ranjan Kumar <ranjan.kumar@broadcom.com>
Fixes: c0767560b012 ("scsi: mpt3sas: Reload SBR without rebooting HBA")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20250210203936.2946494-3-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>