The extra pair of parantheses is not needed and causes clang to generate
warnings about the DM_DEV_CREATE_CMD comparison in validate_params().

Also remove another double parentheses that doesn't cause a warning.
Signed-off-by: NMatthias Kaehlcke <mka@chromium.org>
Signed-off-by: NMike Snitzer <snitzer@redhat.com>