Staging: rtl8723au: Add blank line after declarations

The following patch fixes the checkpatch.pl warning:
drivers/staging/rtl8723au/core/rtw_ap.c WARNING: Missing a blank
line after declarations

Signed-off-by: Dilek Uzulmez <dilekuzulmez@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>