crypto: ecc - Silence sparse warning

Rewrite the bitwise operations to silence the sparse warnings:

  CHECK   ../crypto/ecc.c
../crypto/ecc.c:1387:39: warning: dubious: !x | y
../crypto/ecc.c:1397:47: warning: dubious: !x | y

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Vitaly Chikunov <vt@altlinux.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/ecc.c

@@ -1384,7 +1384,8 @@ void ecc_point_mult_shamir(const struct ecc_point *result,
 
 	num_bits = max(vli_num_bits(u1, ndigits), vli_num_bits(u2, ndigits));
 	i = num_bits - 1;
-	idx = (!!vli_test_bit(u1, i)) | ((!!vli_test_bit(u2, i)) << 1);
+	idx = !!vli_test_bit(u1, i);
+	idx |= (!!vli_test_bit(u2, i)) << 1;
 	point = points[idx];
 
 	vli_set(rx, point->x, ndigits);
@@ -1394,7 +1395,8 @@ void ecc_point_mult_shamir(const struct ecc_point *result,
 
 	for (--i; i >= 0; i--) {
 		ecc_point_double_jacobian(rx, ry, z, curve);
-		idx = (!!vli_test_bit(u1, i)) | ((!!vli_test_bit(u2, i)) << 1);
+		idx = !!vli_test_bit(u1, i);
+		idx |= (!!vli_test_bit(u2, i)) << 1;
 		point = points[idx];
 		if (point) {
 			u64 tx[ECC_MAX_DIGITS];