printk: factor out message formatting from devkmsg_read()

printk: factor out message formatting from devkmsg_read()

The extended message formatting used for /dev/kmsg will be used implement
extended consoles.  Factor out msg_print_ext_header() and
msg_print_ext_body() from devkmsg_read().

This is pure restructuring.

Signed-off-by: Tejun Heo <[email protected]>
Cc: David Miller <[email protected]>
Cc: Kay Sievers <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Cc: Tetsuo Handa <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>