Issue #17782: Fix undefined behaviour on platforms where ``struct timespec``'s "tv_nsec" member is not a C long.

- Issue #17782: Fix undefined behaviour on platforms where ``struct timespec``'s "tv_nsec" member is not a C long.

Thanks to David D Lowe for reporting.

Thanks to David D Lowe for reporting.

  variable if empty path argument is specified.  Patch by Serhiy Storchaka.

  variable if empty path argument is specified.  Patch by Serhiy Storchaka.

The C version tried to remove trailing whitespace between the last quote and
the newline character. I am not sure why it had this because pickle never
generated such pickles---for this to happen repr(some_string) would need to
return trailing whitespace. It was maybe there to make it easier for people
to write pickles in text editors. Anyhow, the Python version doesn't do this
so there is no point keeping this around anymore.

Also, I've changed the exception raised when a bad pickle is encountered.
Again this unlikely to make much difference to anyone though it does make
testing slightly nicer for us.

 * No need to double-check that strings are ready: test already done by
   PyUnicode_FromObject()
 * Remove useless kind variable (use kind1 instead)

 * Check also that right is a Unicode object
 * call directly resize_compact() instead of unicode_resize() for a more
   explicit error handling, and to avoid testing some properties twice
   (ex: unicode_modifiable())

Patch by Jason Michalski.

Patch by Jason Michalski.