Set return 1 instead of 0

Signed-off-by: Ricardo Zanini <[email protected]>

.github/workflows/checks.yml

@@ -103,6 +103,5 @@ jobs:
           if [ $? -ne 0 ]; then
             echo "Generation has not been done on this PR. Did you run 'make generate-all' before sending the PR? See changes below:"
             git --no-pager diff
-            exit 1
+            return 1
           fi
-          exit 0