sched/fair: Remove impossible condition from find_idlest_group_cpu()

find_idlest_group_cpu() goes through CPUs of a group previous selected by
find_idlest_group(). find_idlest_group() returns NULL if the local group is the
selected one and doesn't execute find_idlest_group_cpu if the group to which
'cpu' belongs to is chosen. So we're always guaranteed to call
find_idlest_group_cpu() with a group to which 'cpu' is non-local.

This makes one of the conditions in find_idlest_group_cpu() an impossible one,
which we can get rid off.

Signed-off-by: Joel Fernandes <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Brendan Jackman <[email protected]>
Reviewed-by: Vincent Guittot <[email protected]>
Cc: Android Kernel <[email protected]>
Cc: Atish Patra <[email protected]>
Cc: Chris Redpath <[email protected]>
Cc: Dietmar Eggemann <[email protected]>
Cc: EAS Dev <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: Juri Lelli <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Morten Ramussen <[email protected]>
Cc: Patrick Bellasi <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Rohit Jain <[email protected]>
Cc: Saravana Kannan <[email protected]>
Cc: Srinivas Pandruvada <[email protected]>
Cc: Steve Muckle <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vikram Mulukutla <[email protected]>
Cc: Viresh Kumar <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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