Set strace_child only in the right branch

"strace_child = pid" assignment was racing in NOMMU case
because of vfork (no way to know which process would win).

After this change, strace_child is set to nonzero only
in one process after [v]fork.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
1 file changed