fix(get_addons): replace bad test

get_addons

@@ -25,11 +25,11 @@ modules="$@"
 
 set +e
 git clone --branch "${ref}" --filter=tree:0 "${repo}" "${TMP_REPO_PATH}"
-if [ "$?" != 0 ]; then
+if [ "$?" -ne 0 ]; then
   git clone --filter=tree:0 "${repo}" "${TMP_REPO_PATH}"
-  if [ "$?" != 0 ]; then
+  if [ "$?" -ne 0 ]; then
     git clone --single-branch --branch "${ref}" --depth 1 "${repo}" "${TMP_REPO_PATH}"
-    if [ "$?" != 0 ]; then
+    if [ "$?" -ne 0 ]; then
       git clone "${repo}" "${TMP_REPO_PATH}"
     fi
   fi