fix working dir location

cros_enter_sdk.sh

@@ -3,7 +3,12 @@
 # Create working directory 
 #
 _working_dir_name=$1
-_working_dir_name=${_working_dir_name::-1}
+
+if [ ${_working_dir_name: -1} = " " ]; then
+    #somehow there's a space char when expect argument
+    _working_dir_name=${_working_dir_name::-1}
+fi
+
 _working_full_path="${_parentdir}/${_working_dir_name}"
 cd ${_working_full_path}
 echo "GOTO: ${_working_full_path}"