x86/IRQ: drop redundant cpumask_empty() from move_masked_irq()

The subsequent cpumask_intersects() covers the "empty" case quite fine.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/arch/x86/irq.c

@@ -658,9 +658,6 @@ void move_masked_irq(struct irq_desc *desc)
     
     desc->status &= ~IRQ_MOVE_PENDING;
 
-    if (unlikely(cpumask_empty(pending_mask)))
-        return;
-
     if (!desc->handler->set_affinity)
         return;