Refactoring: move struct dir and dirlookup() to function scope

Preperation for new feature to delete zero byte sized resource forks.

Signed-off-by: Ralph Boehme <rb@sernet.de>
Refactoring: move forkpath computation to function scope

Preperation for new feature to delete zero byte sized resource forks.

Signed-off-by: Ralph Boehme <rb@sernet.de>
Delete 0 byte size resource fork ._ files

Signed-off-by: Ralph Boehme <rb@sernet.de>