Return value from ptep_get_and_clear_full() directly instead of taking
this in another redundant variable.

Link: https://lkml.kernel.org/r/202211282107437343474@zte.com.cnSigned-off-by: Nzhang songyi <zhang.songyi@zte.com.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>