rem: return (strncmp("dvd:/", totem->mrl, strlen ("dvd:/")) == 0);
add: return g_str_has_prefix (totem->mrl, "dvd:/");
context: totem_playing_dvd (Totem *totem){	if (totem->mrl == NULL)		return FALSE;	return (strncmp("dvd:/", totem->mrl, strlen ("dvd:/")) == 0);}