test: Do not swallow flake8 exit code

Author: hebasto

test/lint/lint-python.sh

@@ -90,12 +90,20 @@ elif PYTHONWARNINGS="ignore" flake8 --version | grep -q "Python 2"; then
     exit 0
 fi
 
-PYTHONWARNINGS="ignore" flake8 --ignore=B,C,E,F,I,N,W --select=$(IFS=","; echo "${enabled[*]}") $(
+EXIT_CODE=0
+
+if ! PYTHONWARNINGS="ignore" flake8 --ignore=B,C,E,F,I,N,W --select=$(IFS=","; echo "${enabled[*]}") $(
     if [[ $# == 0 ]]; then
         git ls-files "*.py"
     else
         echo "$@"
     fi
-)
+); then
+    EXIT_CODE=1
+fi
+
+if ! mypy --ignore-missing-imports $(git ls-files "test/functional/*.py"); then
+    EXIT_CODE=1
+fi
 
-mypy --ignore-missing-imports $(git ls-files "test/functional/*.py")
+exit $EXIT_CODE