sexpr: symbol lookup should return a value
sexpr: symbol lookup should return a value

Returning an expression seems odd.  If an sexpr_eval() user really wants to
"return" an expression, it can run sexpr_eval() on it to get a value first.

Signed-off-by: Josef 'Jeff' Sipek <a620f141433c70aa9e43778305a6c68cbfadfb25@josefsipek.net>

jeffpc/libjeffpc,jeffpc/libjeffpc,jeffpc/libjeffpc,jeffpc/libjeffpc