tc: Fix wrong struct variable order

Fix the struct variable order to corrospond with
it's usage.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>

lib/tc.c

@@ -62,8 +62,8 @@ struct tc_pedit_key_ex {
 
 struct flower_key_to_pedit {
     enum pedit_header_type htype;
-    int flower_offset;
     int offset;
+    int flower_offset;
     int size;
 };