when there was no error output and the exit status was zero. Stop
printing the warning in that case.
Signed-off-by: Christian Cornelssen <ccorn@1tein.de>
[rlb@defaultvalue.org: add information from the pr to commit message] Reviewed-by: Rob Browning <rlb@defaultvalue.org> Tested-by: Rob Browning <rlb@defaultvalue.org>