Merge pull request #3115 from vpeter4/le_tmp_full

scripts/mkimage: show message when temp folder is full

scripts/mkimage

@@ -39,11 +39,16 @@ cleanup() {
 }
 
 show_error() {
-  echo -e "image: error happen...\n"
-  cat "${SAVE_ERROR}"
+  echo "image: An error has occurred..."
   echo
+  if [ -s "${SAVE_ERROR}" ]; then
+    cat "${SAVE_ERROR}"
+  else
+    echo "Folder $LE_TMP might be out of free space..."
+  fi
+  echo 
   cleanup
-  exit 1
+  die
 }
 
 trap cleanup SIGINT