remove 3 redundant casts in Objects/longobject.c (#445)

Author: orenmn

Objects/longobject.c

@@ -316,7 +316,7 @@ PyLong_FromUnsignedLong(unsigned long ival)
  if (ival < PyLong_BASE)
  return PyLong_FromLong(ival);
  /* Count the number of Python digits. */
- t = (unsigned long)ival;
+ t = ival;
  while (t) {
  ++ndigits;
  t >>= PyLong_SHIFT;
@@ -854,7 +854,7 @@ _PyLong_FromByteArray(const unsigned char* bytes, size_t n,
  /* Because we're going LSB to MSB, thisbyte is
  more significant than what's already in accum,
  so needs to be prepended to accum. */
- accum |= (twodigits)thisbyte << accumbits;
+ accum |= thisbyte << accumbits;
  accumbits += 8;
  if (accumbits >= PyLong_SHIFT) {
  /* There's enough to fill a Python digit. */
@@ -1121,7 +1121,7 @@ PyLong_FromUnsignedLongLong(unsigned long long ival)
  if (ival < PyLong_BASE)
  return PyLong_FromLong((long)ival);
  /* Count the number of Python digits. */
- t = (unsigned long long)ival;
+ t = ival;
  while (t) {
  ++ndigits;
  t >>= PyLong_SHIFT;