This patch fix checkpatch issues for upcomming patches according to the
sched api file. It changes mostly how to check on null pointer.
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>