ring-buffer: rb_event_is_commit() can return boolean
ring-buffer: rb_event_is_commit() can return boolean

Make rb_event_is_commit() return bool to improve readability
due to this particular function only using either one or zero as its
return value.

No functional change.

Link: http://lkml.kernel.org/r/1443537816-5788-7-git-send-email-d469e57429c50a2c14d8f9c62453b78f8cea7872@163.com

Signed-off-by: Yaowei Bai <d469e57429c50a2c14d8f9c62453b78f8cea7872@163.com>
Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs