fix cp new package

aarch64_build_kit.sh

@@ -34,7 +34,9 @@ prepare_work_dir() {
 
     # if new packages copy all
     if [[ -e ${_BUILD}/$1/.new ]]; then
-        cp -a $(ls | ${_BUILD}/$1/ | grep -vP '^work$' ${_BUILD}/$1/${_WORK_DIR}/
+        pushd ${_BUILD}/$1/ 2>&1>/dev/null
+        cp -a $(ls | grep -vP '^work$') ${_BUILD}/$1/${_WORK_DIR}/
+        popd 2>&1>/dev/null
         return 1
     fi