swapping lines to make gcc happy

libmysql/libmysql.c:
  fix to make autobuild happy.

libmysql/libmysql.c

@@ -1287,8 +1287,8 @@ int STDCALL
 mysql_shutdown(MYSQL *mysql, enum enum_shutdown_level shutdown_level)
 {
   uchar level[1];
-  level[0]= (uchar) shutdown_level;
   DBUG_ENTER("mysql_shutdown");
+  level[0]= (uchar) shutdown_level;
   DBUG_RETURN(simple_command(mysql, COM_SHUTDOWN, (char *)level, 1, 0));
 }