proto: Use proper type for preferred_compression field

No need to use an uint8 typed member, we can directly use the
appropriate enum8 type here, which makes everything more explicit.

(cherry picked from spice-protocol commit 8a3def14e35039753097094ba356e85e8fc2d128)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/spice.proto b/spice.proto
index db015a5..3bca900 100644
--- a/spice.proto
+++ b/spice.proto
@@ -935,7 +935,7 @@ channel DisplayChannel : BaseChannel {
     } stream_report;
 
     message {
-        uint8 image_compression;
+        image_compression image_compression;
     } preferred_compression;
 };