staging: rtl8188eu: remove break after return

Remove "break" statement after a "return" statement as
it does not get executed.

Found by checkpatch.pl - break is not useful after a goto
or return

Signed-off-by: Supriya Karanth <iskaranth@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>