iommu/pamu: Use kzfree() in fsl_pamu_probe()

Use kzfree() instead of opencoded memset with 0 followed by kfree().
Null check is not required since kzfree() checks for NULL internally.

Signed-off-by: Denis Efremov <efremov@linux.com>
Link: https://lore.kernel.org/r/20200604123709.96561-1-efremov@linux.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/fsl_pamu.c

@@ -1174,10 +1174,7 @@ error:
 	if (irq != NO_IRQ)
 		free_irq(irq, data);
 
-	if (data) {
-		memset(data, 0, sizeof(struct pamu_isr_data));
-		kfree(data);
-	}
+	kzfree(data);
 
 	if (pamu_regs)
 		iounmap(pamu_regs);