smbd: Reduce the complexity of open_file_ntcreate

smbd: Reduce the complexity of open_file_ntcreate

This removes two variables in open_file_ntcreate based on the observation
that for exclusive and batch oplocks there can only be one entry. So
in these cases we don't need to keep pointers from find_oplock_types to
delay_for_oplocks. We can just reference the only share mode entry around.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>