staging: r8188eu: remove the helpers of usb_write_port_cancel()

Remove the unnecessary _rtw_write_port_cancel() and usb_write_port_cancel()
and embed their code into the caller (i.e., rtw_write_port_cancel()).

_rtw_write_port_cancel() is a mere redefinition of rtw_write_port_cancel()
and it is unneeded. usb_write_port_cancel() was the only functions
assigned to the (*_usb_write_port_cancel) pointer, so we can simply remove
it and make a direct call.

This patch is in preparation for the _io_ops structure removal.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Co-developed-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Link: https://lore.kernel.org/r/20210917071837.10926-13-fmdefrancesco@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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