tty: serial: fsl_lpuart: fix crash in lpuart_uport_is_active

tty: serial: fsl_lpuart: fix crash in lpuart_uport_is_active

BugLink: https://bugs.launchpad.net/bugs/2016879
commit 178e00f36f934a88682d96aa046c1f90cb6f83a7 upstream.

For serdev framework, tty->dev is a NULL pointer, lpuart_uport_is_active
calling device_may_wakeup() may cause kernel NULL pointer crash, so here
add the NULL pointer check before using it.

Fixes: 4f5cb8c5e915 ("tty: serial: fsl_lpuart: enable wakeup source for lpuart")
Cc: stable <stable@kernel.org>
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20230323110923.24581-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>