tty/hvc_opal: simplify if-if to if-else

Use if and else instead of if(A) and if (!A).

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Link: https://lore.kernel.org/r/20220426071041.168282-1-wanjiabing@vivo.com


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