Staging: rtl8723au: Fixed error 'else should follow close brace '}".

This patch fixes error 'else should follow close brace '}"
found by checkpatch in driver rtl8723au.

Signed-off-by: Yeliz Taneroglu <yeliztaneroglu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>