Removed copying of parameters as this leads to memory leaks in embedded server.

Fixed 'not initialized' memory error.

sql/sql_udf.cc

@@ -202,6 +202,8 @@ void udf_init()
   new_thd->version--;				// Force close to free memory
   close_thread_tables(new_thd);
   delete new_thd;
+  /* Remember that we don't have a THD */
+  my_pthread_setspecific_ptr(THR_THD,  0);
   DBUG_VOID_RETURN;
 }