Fix NT_STATUS_OBJECT_NAME_NOT_FOUND error

If the share contain two folders with the samba name but different case, the
smb list command list both of them, but when opening a folder always the lower
cased one is opened, so trying to open a file fails with object name not found.
Merge branch 'scabrero/samba-fix-nt-status-object-name-not-found' into 3.2

Conflicts:
	main/samba/ChangeLog