BitPolynom.__init__ does not allow bytes type

[marinelay]

It is the same issue as #2384 that occurs in other method BitPolynom.__init__:

pwntools/pwnlib/util/crc/__init__.py

Lines 33 to 80 in 5981c72

	class BitPolynom(object):
	"""Class for representing GF(2)[X], i.e. the field of polynomials over
	GF(2).
	In practice the polynomials are represented as numbers such that `x**n`
	corresponds to `1 << n`. In this representation calculations are easy: Just
	do everything as normal, but forget about everything the carries.
	Addition becomes xor and multiplication becomes carry-less multiplication.
	Examples:
	>>> p1 = BitPolynom("x**3 + x + 1")
	>>> p1
	BitPolynom('x**3 + x + 1')
	>>> int(p1)
	11
	>>> p1 == BitPolynom(11)
	True
	>>> p2 = BitPolynom("x**2 + x + 1")
	>>> p1 + p2
	BitPolynom('x**3 + x**2')
	>>> p1 * p2
	BitPolynom('x**5 + x**4 + 1')
	>>> p1 // p2
	BitPolynom('x + 1')
	>>> p1 % p2
	BitPolynom('x')
	>>> d, r = divmod(p1, p2)
	>>> d * p2 + r == p1
	True
	>>> BitPolynom(-1)
	Traceback (most recent call last):
	...
	ValueError: Polynomials cannot be negative: -1
	>>> BitPolynom('y')
	Traceback (most recent call last):
	...
	ValueError: Not a valid polynomial: y
	"""
	def __init__(self, n):
	if isinstance(n, (bytes, six.text_type)):
	self.n = 0
	x = BitPolynom(2)
	try:
	for p in n.split('+'):

This code handles that n is bytes, but it always raise the type error at line 80.
The way to fix it will be the same as #2384.

Thank you.