sched: extract walk_tg_tree(), fix
sched: extract walk_tg_tree(), fix

fix:

 kernel/sched.c: In function '__rt_schedulable':
 kernel/sched.c:8771: error: implicit declaration of function 'walk_tg_tree'
 kernel/sched.c:8771: error: 'tg_nop' undeclared (first use in this function)
 kernel/sched.c:8771: error: (Each undeclared identifier is reported only once
 kernel/sched.c:8771: error: for each function it appears in.)

Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs