Some functions used zap_details depends on assumption that
zap_details parameter should be NULLed if some fields are 0.
This patch removes that dependency for next patch easy review/merge.
It should not chanage behavior.
Signed-off-by: Minchan Kim<minchan.kim@xxxxxxxxx>
Cc: Rik van Riel<riel@xxxxxxxxxx>
Cc: KOSAKI Motohiro<kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Johannes Weiner<hannes@xxxxxxxxxxx>
Cc: Nick Piggin<npiggin@xxxxxxxxx>
Cc: Mel Gorman<mel@xxxxxxxxx>
Cc: Wu Fengguang<fengguang.wu@xxxxxxxxx>
Cc: Hugh Dickins<hughd@xxxxxxxxxx>