mailbox: tegra: avoid resume NULL mailboxes

If Tegra HSP device tree does not have 'shared irqs',
mailboxes pointer is NULL. Add non-NULL HSP mailboxes
check in resume callback before tegra_hsp_mailbox_startup()
call and prevent NULL pointer exception.
Signed-off-by: Bitan Biswas <bbiswas@nvidia.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

drivers/mailbox/tegra-hsp.c

@@ -782,12 +782,14 @@ static int __maybe_unused tegra_hsp_resume(struct device *dev)
 			tegra_hsp_doorbell_startup(db->channel.chan);
 	}
 
+	if (hsp->mailboxes) {
 		for (i = 0; i < hsp->num_sm; i++) {
 			struct tegra_hsp_mailbox *mb = &hsp->mailboxes[i];
 
 			if (mb->channel.chan->cl)
 				tegra_hsp_mailbox_startup(mb->channel.chan);
 		}
+	}
 
 	return 0;
 }