staging: r8188eu: convert rtw_xmit_resource_alloc() to common error logic

Convert the function rtw_xmit_resource_alloc() away from returning
_FAIL or _SUCCESS which uses inverted error logic. Use the common
error logic instead. Return 0 for success and negative values for
failure.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20221111083733.3144-3-straube.linux@gmail.com


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