kvm: don't redefine flags as something else

The function irqfd_wakeup() has flags defined as __poll_t and then it
has additional flags which is used for irqflags.

Redefine the inner flags variable as iflags so it does not shadow the
outer flags.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: kvm@vger.kernel.org
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

virt/kvm/eventfd.c

@@ -214,9 +214,9 @@ irqfd_wakeup(wait_queue_entry_t *wait, unsigned mode, int sync, void *key)
 
 	if (flags & EPOLLHUP) {
 		/* The eventfd is closing, detach from KVM */
-		unsigned long flags;
+		unsigned long iflags;
 
-		spin_lock_irqsave(&kvm->irqfds.lock, flags);
+		spin_lock_irqsave(&kvm->irqfds.lock, iflags);
 
 		/*
 		 * We must check if someone deactivated the irqfd before
@@ -230,7 +230,7 @@ irqfd_wakeup(wait_queue_entry_t *wait, unsigned mode, int sync, void *key)
 		if (irqfd_is_active(irqfd))
 			irqfd_deactivate(irqfd);
 
-		spin_unlock_irqrestore(&kvm->irqfds.lock, flags);
+		spin_unlock_irqrestore(&kvm->irqfds.lock, iflags);
 	}
 
 	return 0;