If the joint had failed, the chroming would be cracked and chipping.
That's just a poorly finished braze job that got chromed over. Don't worry about it.
Look for any damage to the chrome plating though - especially after the fork is re-aligned.
Thought about buying a carbon fiber one? It would lighten the bike and make the ride less harsh. Ones with 1" threaded steerers can be found for cheap since they're frequently on closeout these days.