Fix variable name

gitlab/deploy.sh

@@ -16,11 +16,7 @@ if [ "${VISIBILITY}" != "public" ]; then
 fi
 
 log_info "Creating source distribution..."
-run_cmd $(PREFIX)/bin/python setup.py check sdist --formats zip
-if [ $? != 0 ]; then
-  log_error "Could not create source distribution zip file"
-  exit 1
-fi
+run_cmd ${PREFIX}/bin/python setup.py check sdist --formats zip
 
 log_info "Uploading package to ${PYPISERVER} on behalf of ${PYPIUSER}..."
 twine register --username ${PYPIUSER} --password ${PYPIPASS} dist/*.zip