Correct return value from jenkins script for failure

rm examples/results.csv || true

cd examples

python benchmark.py -d tox21

export retval1=$?

cd ..

nosetests -v devtools/jenkins/compare_results.py --with-xunit || true

export retval2=$?

source deactivate

conda remove --name $envname --all

export retval=$(($retval1 + $retval2))

return ${retval}

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