Revert "Check for memory granted by get_dist_name"

This reverts commit 80ad89e384e04bd0835a13f246840f4f71113263.

The commit have a few problems, unfortunately I overlooked it.

1. return NULL from get_dist_name() is perfectly valid,
   it means that both tmpl->dist nor tmpl->ostmpl are NULL.
   This NULL is later handled by read_dist_actions().
   With this patch return NULL from get_dist_name() becomes
   an error, but there is no error!

2. return code VZ_SET_NAME_ERROR is just wrong.

3. In vps_start_custom() we silently fail if OSTEMPLATE
   is not specified in CT config. This leads to vzctl start
   to silently fail to start a CT and exit with the wrong
   exit code (see 2).
3 files changed