staging: r8188eu: remove unused function parameter

The regs parameter of the usb_write_port_complete function is not used. We
can remove it.

We can also remove the macro to hide the regs parameter when
usb_write_port_complete is used as callback function for an urb transfer.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20230110205626.183516-4-martin@kaiser.cx


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