BUG: Exceptions are not explicitly raised in python when validating output.

[zoj613]

htnorm/pyhtnorm/_htnorm.pyx

Lines 98 to 109 in ef1f2e4

	cdef inline void validate_return_info(int info):
	if info == HTNORM_ALLOC_ERROR:
	raise MemoryError("Not enough memory to allocate resources.")
	elif info < 0:
	raise ValueError("Possible illegal value in one of the inputs.")
	elif info > 0:
	raise ValueError(
	f"""Either the leading minor of the {info}'th order is not
	positive definite (meaning the covariance matrix is also not
	positive definite), or factorization of one of the inputs
	returned a `U` with a zero in the {info}'th diagonal."""
	)

Since this cython function has void return type, the raised exception is not propagated properly and thus gets treated as a warning.

To remedy this, the function should return an int. A value of zero when everything checks out and probably a -1 otherwise.