cfs_rq is declared twice, fix it.

Also use 'se' instead of '&p->se'.
Signed-off-by: NKirill Tkhai <tkhai@yandex.ru>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/169201374366727@web6d.yandex.ruSigned-off-by: NIngo Molnar <mingo@kernel.org>