Don't assert the format until we have done the error check.

The ticket (#799) probably triggers this by using std.random()
without a "import std" statement.

Fixes: #799



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5458 d4fa192b-c00b-0410-8231-f00ffab90ce4

lib/libvcl/vcc_expr.c

@@ -663,8 +663,8 @@ vcc_expr_mul(struct vcc *tl, struct expr **e, enum var_type fmt)
 		tk = tl->t;
 		vcc_NextToken(tl);
 		vcc_expr4(tl, &e2, f2);
-		assert(e2->fmt == f2);
 		ERRCHK(tl);
+		assert(e2->fmt == f2);
 		if (tk->tok == '*')
 			*e = vcc_expr_edit(f3, "(\v1*\v2)", *e, e2);
 		else