This fixes a compiler warning:
./src/ecdsa_impl.h:312:12: warning: use of bitwise '&' with boolean operands [-Wbitwise-instead-of-logical] return !secp256k1_scalar_is_zero(sigr) & !secp256k1_scalar_is_zero(sigs); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is a backport of secp256k1#1009