staging: most: video: fix build warnings

Commit 7d7cdb4f ("staging: most: video: remove debugging code") ended up
adding a bunch of build warnings about unused variables.  Fix that up by
removing those variables as we don't need them anymore.

Cc: Abdun Nihaal <abdun.nihaal@gmail.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: 7d7cdb4f ("staging: most: video: remove debugging code")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>