btrfs: be a bit more careful when setting mirror_num_ret in btrfs_map_block
The mirror_num_ret is allowed to be NULL, although it has to be set when smap is set. Unfortunately that is not a well enough specifiable invariant for static type checkers, so add a NULL check to make sure they are fine. Fixes: 03793cbb ("btrfs: add fast path for single device io in __btrfs_map_block") Reported-by:Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by:
Qu Wenruo <wqu@suse.com> Reviewed-by:
Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
David Sterba <dsterba@suse.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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b19c98f2