xen/arm: irq: add missing spin_unlock() in init_local_irq_data() error path

If init_one_irq_desc() fails, init_local_irq_data() returns without
releasing local_irqs_type_lock, leading to a possible deadlock.

Release the lock before returning to ensure proper cleanup.

Fixes: 2bb32b8092 ("xen/irq: Propagate the error from init_one_desc_irq() in init_*_irq_data()")
Signed-off-by: Mykola Kvach <mykola_kvach@epam.com>
Reviewed-by: Denis Mukhin <dmukhin@ford.com>
Acked-by: Julien Grall <jgrall@amazon.com>

xen/arch/arm/irq.c

@@ -94,7 +94,10 @@ static int init_local_irq_data(unsigned int cpu)
         int rc = init_one_irq_desc(desc);
 
         if ( rc )
+        {
+            spin_unlock(&local_irqs_type_lock);
             return rc;
+        }
 
         desc->irq = irq;
         desc->action  = NULL;