sched: Remove bogus parameter in structured comment

The balance parameter was removed by 23f0d209 ("sched: Factor out
code to should_we_balance()", 2013-08-06).

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381400433-2030-1-git-send-email-artagnon@gmail.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>