Coverity 652910 Uninitialized pointer read

Hello Igor,

Covertiy complains that avb_replace() might be called with and 
uninitialzed value of dm_verity_mode.

I think to fix the issue following change is needed:

$ git diff
diff --git a/lib/libavb/avb_cmdline.c b/lib/libavb/avb_cmdline.c
index 842629abe0e..f2d2e350d6b 100644
--- a/lib/libavb/avb_cmdline.c
+++ b/lib/libavb/avb_cmdline.c
@@ -333,7 +333,7 @@ AvbSlotVerifyResult avb_append_options(
          // Should never get here because MANAGED_RESTART_AND_EIO is
          // remapped by avb_manage_hashtree_error_mode().
          avb_assert_not_reached();
-        break;
+        return AVB_SLOT_VERIFY_RESULT_ERROR_IO;
        case AVB_HASHTREE_ERROR_MODE_PANIC:
          verity_mode = "panicking";
          dm_verity_mode = "panic_on_corruption";

Do you know where the upstream code lives that we copied?

Probably we want to fix upstream first.

Best regards

Heinrich