Mike Snitzer 665022d72f dm cache: avoid calls to prealloc_free_structs() if possible
If no work was performed then prealloc_data_structs() wasn't ever called
so there isn't any need to call prealloc_free_structs().

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2015-07-16 22:32:08 -04:00
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