staging: r8188eu: core: remove goto statement

Remove the goto statement from rtw_do_join(). In this function goto
can be replace by return statement. As on goto label exit, function only
return it is not performing any cleanup. Avoiding goto will improve
the function readability.

Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Link: https://lore.kernel.org/r/YXafzp5F8T7/+tk2@Sauravs-MacBook-Air.local


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