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

drivers/scsi/ipr.c

@@ -10092,7 +10092,6 @@ static irqreturn_t ipr_test_intr(int irq, void *devp)
 {
 	struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)devp;
 	unsigned long lock_flags = 0;
-	irqreturn_t rc = IRQ_HANDLED;
 
 	dev_info(&ioa_cfg->pdev->dev, "Received IRQ : %d\n", irq);
 	spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
@@ -10101,7 +10100,7 @@ static irqreturn_t ipr_test_intr(int irq, void *devp)
 	wake_up(&ioa_cfg->msi_wait_q);
 
 	spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
-	return rc;
+	return IRQ_HANDLED;
 }
 
 /**