simplify the condition for setting the euid of the process. Now it is
always set when we are running as root, the issue was introduced with
the commit 52c081b02c4ca4432330ee336a60f6f803431e63
Changelog: 2018-11-24 - seh - enforce that euid only gets set to ruid if
it currently == 0 (i.e. really was setuid-*root*).
Closes: https://github.com/genuinetools/img/issues/191
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Signed-off-by: Serge Hallyn <shallyn@cisco.com>