nvme-multipath: zero out ANA log buffer
When nvme_init_identify() fails the ANA log buffer is deallocated but _not_ set to NULL. This can cause double free oops when this controller is deleted without ever being reconnected. Signed-off-by: NHannes Reinecke <hare@suse.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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