mailbox: mchp-ipc-sbi: Add null check for devm_kasprintf()

Add a check to see if devm_kasprintf() is not NULL in
mchp_ipc_get_cluster_aggr_irq(), returning -ENOMEM if the function
failed.

Assisted-by: gkh_clanker_t1000
CC: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Griffin Kroah-Hartman <griffin@kroah.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/mailbox/mailbox-mchp-ipc-sbi.c

diff --git a/drivers/mailbox/mailbox-mchp-ipc-sbi.c b/drivers/mailbox/mailbox-mchp-ipc-sbi.c
index b87bf2f..f081f8a 100644
--- a/drivers/mailbox/mailbox-mchp-ipc-sbi.c
+++ b/drivers/mailbox/mailbox-mchp-ipc-sbi.c
@@ -378,6 +378,8 @@ static int mchp_ipc_get_cluster_aggr_irq(struct mchp_ipc_sbi_mbox *ipc)
 	for_each_online_cpu(cpuid) {
 		hartid = cpuid_to_hartid_map(cpuid);
 		irq_name = devm_kasprintf(ipc->dev, GFP_KERNEL, "hart-%lu", hartid);
+		if (!irq_name)
+			return -ENOMEM;
 		ret = platform_get_irq_byname_optional(pdev, irq_name);
 		if (ret <= 0)
 			continue;