/* tmp_felem(i-1) is the product of Z(0) .. Z(i-1),
* tmp_felem(i) is the inverse of the product of Z(0) .. Z(i)
*/
- felem_mul(tmp_felem(num), tmp_felem(i-1), tmp_felem(i)); /* 1/Z(i) */
+ /* 1/Z(i) */
+ felem_mul(tmp_felem(num), tmp_felem(i-1), tmp_felem(i));
else
felem_assign(tmp_felem(num), tmp_felem(0)); /* 1/Z(0) */