serial: core: Include console.h from serial_core.h

In the static inline function uart_handle_break() in serial_core.h we
dereference port->cons. That gives an error unless console.h is also
included.

This error hasn't shown up till now because everyone who has defined
SUPPORT_SYSRQ has also included console.h, but it's a bit ugly to make
this requirement. Let's make the include explicit.

Signed-off-by: Douglas Anderson <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

include/linux/serial_core.h

···
 
 #include <linux/bitops.h>
 #include <linux/compiler.h>
+#include <linux/console.h>
 #include <linux/interrupt.h>
 #include <linux/circ_buf.h>
 #include <linux/spinlock.h>