tools: record: fix dmi recording

tools: record: fix dmi recording

Processing os-release in the same buffer that the dmi modalias used caused the
dmi to be recorded as 'dmi: "VERSION_ID=31"'. The cause for that was simply
that the dmi modalias was read but not printed until after the os-release
information was processed.

Fix this two-fold: rearrange that each part now reads and prints in
one go, and rename the buffers so we don't re-use them.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>