tty: hvcs: simplify if-if to if-else

Use if and else instead of if(A) and if (!A) and fix a coding style.

Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Link: https://lore.kernel.org/r/20220424091310.98780-1-wanjiabing@vivo.com


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