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Check that void function can return a value

--- a/stmt.c

+++ b/stmt.c

@@ -17,7 +17,9 @@

 	expect(RETURN);

 	np = expr();

 	if (np->type != tp) {

-		if ((np = convert(np, tp, 0)) == NULL)

+		if (tp == voidtype)

+			warn(1, "function returning void returns a value");

+		else if ((np = convert(np, tp, 0)) == NULL)

 			error("incorrect type in return");

 	}

 	emitret(tp);