Security: Fix memory leak in private_fl_directory_copy_recurse().

Security: Fix memory leak in private_fl_directory_copy_recurse().

The cause is not as clear to me.
The memory address is being copied and so it should be being freed.
There could be some compiler optimization making a bad decision here.

Simplify the logic and remove extra checks.
Operate on the variable before replacing the pointer.
Memory leak seems to be gone now.