genirq/msi: Use kmemdup_array() instead of kmemdup()

Let kmemdup_array() take care about sizing instead of doing it open coded.

Signed-off-by: Jinjie Ruan <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/all/[email protected]

Author: Jinjie Ruan

kernel/irq/msi.c

@@ -82,7 +82,7 @@ static struct msi_desc *msi_alloc_desc(struct device *dev, int nvec,
 	desc->dev = dev;
 	desc->nvec_used = nvec;
 	if (affinity) {
-		desc->affinity = kmemdup(affinity, nvec * sizeof(*desc->affinity), GFP_KERNEL);
+		desc->affinity = kmemdup_array(affinity, nvec, sizeof(*desc->affinity), GFP_KERNEL);
 		if (!desc->affinity) {
 			kfree(desc);
 			return NULL;