xen: events: Remove redundant clear of l2i at end of round-robin loop

Signed-off-by: NKeir Fraser <keir.fraser@citrix.com>
Signed-off-by: NIan Campbell <ian.campbell@citrix.com>
[ijc: forward ported from linux-2.6.18-xen.hg 991:9ba6d9f3fbc0]
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/xen/events.c

@@ -1140,7 +1140,6 @@ static void __xen_evtchn_do_upcall(void)
 				pending_words &= ~(1UL << word_idx);
 
 			word_idx = (word_idx + 1) % BITS_PER_LONG;
-			bit_idx = 0;
 		}
 
 		BUG_ON(!irqs_disabled());