serial: core: fix potential NULL pointer dereference
The commit 761ed4a9 ("tty: serial_core: convert uart_close to use tty_port_close") refactored uart_close() to use tty_port_close(). At the same time it introduced a potential NULL pointer dereference. Rearrange the code to avoid kernel crash. Fixes: 761ed4a9 ("tty: serial_core: convert uart_close to use tty_port_close") Cc: Rob Herring <robh@kernel.org> Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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