There should be little panic in San Francisco if the 49ers' top challenges in free agency consist of re-signing a safety and tight end.The franchise tag is available, if needed, to keep free safety Dashon Goldson or tight end Delanie Walker from leaving. Keeping both players would be ideal. Coach Jim Harbaugh recently called Goldson a player the team wants to reward.2012 Targeting Walker (regular season)Goldson earned Pro Bowl honors each of the last two seasons.