s3/libsmb/py: match input argument types with C types

s3/libsmb/py: match input argument types with C types

If PyArg_ParseTupleAndKeywords() is given, say, an "H" format (meaning
unsigned short int) but the referenced variable is a plain unsigned
int, the top 16 bits of the variable will be left undefined. In that
case we should use an "I" format (and/or initialize the variable).

In many cases the change is fairly innocuous, such as when "i" and "I"
are mixed (for signed and unsigned ints respectively), but the
resulting write is the same size and probably gives the same result in
practice.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Noel Power <npower@samba.org>