staging: r8188eu: remove unnecessary else branch

Remove an else branch in OnAuthClient that is not needed.

If we go into the else branch, go2asoc is 0. We can simply continue and
the last if condition will be false.

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/20221024081417.66441-15-martin@kaiser.cx


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