irqchip/riscv-rpmi-sysmsi: Fix mailbox channel leak in rpmi_sysmsi_probe()

When riscv_acpi_get_gsi_info() fails, the mailbox channel previously
requested via mbox_request_channel() is not freed. Add the missing
mbox_free_channel() call to prevent the resource leak.

Fixes: 4752b0c ("irqchip/riscv-rpmi-sysmsi: Add ACPI support")
Signed-off-by: Felix Gu <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: [email protected]
Reviewed-by: Rahul Pathak <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: outman119

drivers/irqchip/irq-riscv-rpmi-sysmsi.c

@@ -250,6 +250,7 @@ static int rpmi_sysmsi_probe(struct platform_device *pdev)
 		rc = riscv_acpi_get_gsi_info(fwnode, &priv->gsi_base, &id,
 					     &nr_irqs, NULL);
 		if (rc) {
+			mbox_free_channel(priv->chan);
 			dev_err(dev, "failed to find GSI mapping\n");
 			return rc;
 		}