scsi: mpi3mr: Use -ENOMEM instead of -1 in mpi3mr_expander_add()

smatch warnings:

drivers/scsi/mpi3mr/mpi3mr_transport.c:1449 mpi3mr_expander_add() warn:
	returning -1 instead of -ENOMEM is sloppy

No functional change.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/202303202027.ZeDQE5Ug-lkp@intel.com/


Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Link: https://lore.kernel.org/r/20230419064256.2532069-1-harshit.m.mogalapalli@oracle.com


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>