staging: comedi: Removed not necessary braces for single block

This patch is used to remove not necessary braces for single if block.

Signed-off-by: Jitendra Khasdev <jkhasdev@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>