mm: use zone_is_initialized() instead of if(zone->wait_table)
mm: use zone_is_initialized() instead of if(zone->wait_table)

Use "zone_is_initialized()" instead of "if (zone->wait_table)".
Simplify the code, no functional change.

Signed-off-by: Xishi Qiu <dd58e6c73de42ea3812c4e45cc983f071455d7f2@huawei.com>
Cc: Cody P Schafer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs