Slight Issues with sip_array.c format being specified

[Ognyan Moore]

Hi Phil,

Just came across an issue in sip_array.c::sipArray_getbuffer

code to reproduce:

>>> from PyQt6 import sip, QtCore
>>> memoryview(sip.array(QtCore.QPointF, 2))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
BufferError: format has not been specified

Looks like non-scalar types don't have a format, and if the requestor
requests a buffer format to be specified and there isn't one, an exception
is raised.

A more sensible default might be to set the format to bytes in this case.
There is some precedence here as python's PyBuffer_FillInfo will populate
format as "B".

Also, it looks like a memory leak will occur when this exception is raised
as well.

Thanks again for your work on this!
Ogi
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