zram: use zram_free_page instead of open-coded
The zram_free_page already handles NULL handle case and same page so use it to reduce error probability. (Acutaully, I made a mistake when I handled same page feature) Link: http://lkml.kernel.org/r/1492052365-16169-7-git-send-email-minchan@kernel.orgSigned-off-by: Minchan Kim <minchan@kernel.org> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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