staging: r8188eu: remove unnecessary return labels.

Remove the RETURN labels in rtw_alloc_etherdev_with_old_priv() and
rtw_alloc_etherdev() and return directly to clean up the code and
improve readability.

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/20220908130915.8406-5-straube.linux@gmail.com


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