staging: line6: wrap lines to 80 chars in playback.c

There are a few instances of 80+ character lines in playback.c.  Two
instances are just because of a useless comment "this is somewhat
paranoid", so drop the comment.  Other instances are straightforward
line wrapping.

Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>