fix regression in bch.c

src/bch.c

@@ -153,7 +153,9 @@ struct gf_poly {
 
 /* polynomial of degree 1 */
 struct gf_poly_deg1 {
-	struct gf_poly poly;
+	struct {
+		unsigned int deg;
+	} poly;
 	unsigned int   c[2];
 };
 
@@ -991,7 +993,7 @@ static void factor_polynomial(struct bch_control *bch, int k, struct gf_poly *f,
 			/* compute h=f/gcd(f,tk); this will modify f and q */
 			gf_poly_div(bch, f, gcd, q);
 			/* store g and h in-place (clobbering f) */
-			*h = &((struct gf_poly_deg1 *)f)[gcd->deg].poly;
+			*h = (struct gf_poly *) &((struct gf_poly_deg1 *)f)[gcd->deg].poly;
 			gf_poly_copy(*g, gcd);
 			gf_poly_copy(*h, q);
 		}