Use true/false for bool return type of has_bh_in_lru().

Link: http://lkml.kernel.org/r/20191029040529.GA7625@sauravSigned-off-by: NSaurav Girepunje <saurav.girepunje@gmail.com>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>