kmsg - kmsg_dump() use iterator to receive log buffer content

kmsg - kmsg_dump() use iterator to receive log buffer content

Provide an iterator to receive the log buffer content, and convert all
kmsg_dump() users to it.

The structured data in the kmsg buffer now contains binary data, which
should no longer be copied verbatim to the kmsg_dump() users.

The iterator should provide reliable access to the buffer data, and also
supports proper log line-aware chunking of data while iterating.

Signed-off-by: Kay Sievers <[email protected]>
Tested-by: Tony Luck <[email protected]>
Reported-by: Anton Vorontsov <[email protected]>
Tested-by: Anton Vorontsov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>