expect-post-runner.sh: Disable backtracing

This script sources utils.sh, which automatically enables shell backtracing
support on any error (i.e. subcommand exiting with non-0 status). But
expect-post-runner.sh handles exit codes itself, and not intended to terminate
on first non-0 code, so disable "ERR" trap, used for backtracing.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I5ae9959914af4573d8aede47ac8cc93106733759
1 file changed