don't cast LEX_STRING to char* :)

sql/item_func.cc

@@ -3543,7 +3543,7 @@ Item_func_sp::execute(Item **itp)
     m_sp= sp_find_function(thd, m_name);
   if (! m_sp)
   {
-    my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname);
+    my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
     DBUG_RETURN(-1);
   }
 
@@ -3577,7 +3577,7 @@ Item_func_sp::field_type() const
     DBUG_PRINT("info", ("m_returns = %d", m_sp->m_returns));
     DBUG_RETURN(m_sp->m_returns);
   }
-  my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname);
+  my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
   DBUG_RETURN(MYSQL_TYPE_STRING);
 }
 
@@ -3593,7 +3593,7 @@ Item_func_sp::result_type() const
   {
     DBUG_RETURN(m_sp->result());
   }
-  my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname);
+  my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
   DBUG_RETURN(STRING_RESULT);
 }
 
@@ -3606,7 +3606,7 @@ Item_func_sp::fix_length_and_dec()
     m_sp= sp_find_function(current_thd, m_name);
   if (! m_sp)
   {
-    my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname);
+    my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
   }
   else
   {