added check

cov-ngx-voms.sh

@@ -35,4 +35,10 @@ cd cov
 
 geninfo --base-directory ${HOME}/openresty-1.13.6.1/build/nginx-1.13.6/objs/addon/src/ --output-filename coverage.info ${HOME}/openresty-1.13.6.1/build/nginx-1.13.6/objs/addon/src/
 
-genhtml --demangle-cpp coverage.info &> output
+genhtml --demangle-cpp coverage.info &>output
+exit_status=$?
+if [ ! $exit_status -eq 0 ]; then
+   echo "check output"
+fi
+echo $exit_status
+