soc: ti: ti_sci_inta_msi: Switch MSI descriptor locking to guard()

Convert the code to use the new guard(msi_descs_lock).

No functional change intended.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Link: https://lore.kernel.org/all/20250313130321.568379110@linutronix.de

drivers/soc/ti/ti_sci_inta_msi.c

@@ -103,19 +103,15 @@ int ti_sci_inta_msi_domain_alloc_irqs(struct device *dev,
 	if (ret)
 		return ret;
 
-	msi_lock_descs(dev);
+	guard(msi_descs_lock)(dev);
 	nvec = ti_sci_inta_msi_alloc_descs(dev, res);
-	if (nvec <= 0) {
-		ret = nvec;
-		goto unlock;
-	}
+	if (nvec <= 0)
+		return nvec;
 
 	/* Use alloc ALL as it's unclear whether there are gaps in the indices */
 	ret = msi_domain_alloc_irqs_all_locked(dev, MSI_DEFAULT_DOMAIN, nvec);
 	if (ret)
 		dev_err(dev, "Failed to allocate IRQs %d\n", ret);
-unlock:
-	msi_unlock_descs(dev);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(ti_sci_inta_msi_domain_alloc_irqs);