read_dentry_tree() now includes code previously in
read_metadata_resource(), and wraps around read_dentry_tree_recursive()
which is similar to the old read_dentry_tree().
This removes the declaration of a 'struct wim_dentry' on the stack in
read_dentry_tree() and a subsequent copy of the structure, and also
condenses two dentry allocation sites into one.
This also moves the check for '.' and '..' entries to immediately when
reading the dentry tree rather than just before extraction.
git://wimlib.net / wimlib / commit