Remove variable call-time pass by reference in content_admin.inc

Warning: Call-time pass-by-reference has been deprecated - argument passed by value; If you would like to pass it by reference, modify the declaration of content_db_construct_column_type(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. However, future versions may not support this any longer. in /sites/default/modules/cck/content_admin.inc on line 955 and 1000

Initializes variables properly to be passed by reference.