Remove some unnecessary work from from our "ls" code.
* subversion/libsvn_client/list.c (get_dir_contents): don't attempt to match locks when there are none
* subversion/libsvn_ra_svn/client.c (ra_svn_get_dir): according to the protocol spec, we send the name of the dirents (i.e. 1 segment) -- never a multi- segment relpath. There is nothing to canonicalize.