mm/page_alloc: make bad_range() return bool

bad_range() can return bool, so let us change it.

Link: https://lkml.kernel.org/r/20240221073227.276234-1-gehao@kylinos.cn


Signed-off-by: Hao Ge <gehao@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>