staging: r8188eu: reformat usb_write_port_complete

This trivial patch reformats the usb_write_port_complete function.
Hopefully, this makes the code a bit easier to read.

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/20230110205626.183516-3-martin@kaiser.cx


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