tty: serial: 8250: delete redundant printing of return value

platform_get_irq() has already checked and printed the return value,
the printing here is nothing special, it is not necessary at all.

Signed-off-by: Wang Qing <wangqing@vivo.com>
Link: https://lore.kernel.org/r/1615621707-2330-1-git-send-email-wangqing@vivo.com


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