Chlorine is a gas!
In the case of bleach it is held in suspension in a liquid who's pH is
a strong BASE.
If the wall is dry, you can be rest assured there is no Chlorine
remaining in the wall.
Your primary concern should be WHAT Base was used to hold the Chlorine
in liquid suspension.
Bleach at one time used a lye base to hold the chlorine in suspension.
I was told that other bases are used nowadays for this purpose.
The wallboard itself is an alkaline base, a base usually does not harm
a base, so perhaps just resealing the wall with a sealer will prevent
stains from leaching into new surface paint.