staging: rtl8723au: Remove unnecessary else if

Removed the unnecessary else if condition as it has only
one comment inside it and do not have an FIXME or TODO comment near to
it too.

Signed-off-by: Tapasweni Pathak <tapaswenipathak@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>