dm writecache: fix unnecessary NULL check warnings
Remove NULL checks before vfree() to fix these warnings: ./drivers/md/dm-writecache.c:2008:2-7: WARNING: NULL check before some freeing functions is not needed. ./drivers/md/dm-writecache.c:2024:2-7: WARNING: NULL check before some freeing functions is not needed. Signed-off-by: Tian Tao <tiantao6@hisilicon.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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