bcachefs: Refactor bch2_check_dirent_target()

bcachefs: Refactor bch2_check_dirent_target()

Prep work for calling bch2_check_dirent_target() from bch2_lookup().

- Add an inline wrapper, if the target and backpointer match we can skip
  the function call.

- We don't (yet?) want to remove the dirent we did the lookup from (when
  we find a directory or subvol with multiple valid dirents pointing to
  it), we can defer on that until later. For now, add an "are we in
  fsck?" parameter.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>