[PATCH] mempolicy.c GFP fix

zonelist_policy() forgot to mask non-zone bits from gfp when comparing
zone number with policy_zone. 

ACKed-by: Andi Kleen <ak@suse.de>
Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>