Remove unused structure declaration

Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
Acked-by: Pavel Grunt <pgrunt@redhat.com>

server/inputs-channel.c

@@ -116,10 +116,6 @@ struct InputsChannel {
     SpiceTabletInstance *tablet;
 };
 
-typedef struct RedInputsPipeItem {
-    RedPipeItem base;
-} RedInputsPipeItem;
-
 typedef struct RedKeyModifiersPipeItem {
     RedPipeItem base;
     uint8_t modifiers;