kswapd()->try_to_freeze() is defined to return a boolean, so it's better
to use a bool to hold its return value.
Signed-off-by: NJie Liu <jeff.liu@oracle.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>