staging: r8188eu: remove OutEpNumber

Remove the OutEpNumber component of struct hal_data_8188e.
RtNumOutPipes in struct dvobj_priv stores the same info.

Update the only place where OutEpNumber is read.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220806195540.777390-7-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>