scsi: ipr: Directly return instead of using local ret variable

Fixes coccinelle warning:

./drivers/scsi/ipr.c:10095:13-15: Unneeded variable: "rc". Return "IRQ_HANDLED" on line 10104

Link: https://lore.kernel.org/r/1648433103-24308-1-git-send-email-baihaowen@meizu.com


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