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Making exp return NULL if doesn't match a expression

This is really usefull because this means we can call expr() for example in
the for statement without be worried about if the expression will be empty
or not (it is also usefull in the case of return, where you can call it
without be worried).

--- a/expr.c

+++ b/expr.c

@@ -29,7 +29,8 @@

 		expect(')');

 		break;

 	default:

-		error("unexpected element");

+		np = NULL;

+		break;

 	}

 	return np;

 }

--- a/flow.c

+++ b/flow.c

@@ -85,11 +85,11 @@

 	expect(FOR);

 	expect('(');

-	exp1 = (yytoken != ';') ? expr() : NULL;

+	exp1 = expr();

 	expect(';');

-	exp2 = (yytoken != ';') ? expr() : NULL;

+	exp2 = expr();

 	expect(';');

-	exp3 = (yytoken != ')') ? expr() : NULL;

+	exp3 = expr();

 	expect(')');

 	push(OFOR);