btrfs: fix uninitialized variable warning in get_inode_gen
Anybody that calls get_inode_gen() can have an uninitialized gen if there's an error. This isn't a big deal because all the users just exit if they get an error, however it makes -Wmaybe-uninitialized complain, so fix this up to always initialize the passed in gen, this quiets all of the uninitialized warnings in send.c. Reviewed-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NQu Wenruo <wqu@suse.com> Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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