* [a0d9972]->[21d1619] freopen: Don't crash if the filename argument is NULL.
* [a5a35f0]->[c4596b1] freopen: Documentation.
* [9926b90]->[395f9e6]] tests: avoid spurious assertion failure in test-float.c on ppc64
* [a0d9972]->[21d1619] freopen: Don't crash if the filename argument is NULL.
* [a5a35f0]->[c4596b1] freopen: Documentation.
* [9926b90]->[395f9e6]] tests: avoid spurious assertion failure in test-float.c on ppc64