scsi: target: spc: Fix loop traversal in spc_rsoc_get_descr()

Stop traversing after finding the appropriate descriptor.

Signed-off-by: Chaohai Chen <wdhh66@163.com>
Link: https://lore.kernel.org/r/20250124085542.109088-1-wdhh66@163.com


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