UPSTREAM: dm verity: separate function for parsing opt args

Move optional argument parsing into a separate function to make it
easier to add more of them without making verity_ctr even longer.

Bug: 27175947

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Change-Id: I6426dc3ac7e95c3456205fdafa1078fbe9a26743
1 file changed