scsi: qla2xxx: Fix IOCB resource check warning

Make qla_get_iocbs_resource() static to fix the warning:

>> drivers/scsi/qla2xxx/qla_iocb.c:3820:5: warning: no previous prototype for
>> 'qla_get_iocbs_resource' [-Wmissing-prototypes]
    3820 | int qla_get_iocbs_resource(struct srb *sp)
	         |     ^~~~~~~~~~~~~~~~~~~~~~

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>