btrfs: simplify btrfs_iget
Don't open-code iget_failed(), don't bother with btrfs_free_path(NULL), move handling of positive return values of btrfs_lookup_inode() from btrfs_read_locked_inode() to btrfs_iget() and kill now obviously pointless ASSERT() in there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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