LibIPC: Add IPCErrorOr Type alias

Author: https://github.com/Hendiadyoin1
Commit: 50b6e74d33
Pull-request: https://github.com/SerenityOS/serenity/pull/12735
Reviewed-by: https://github.com/AtkinsSJ
Reviewed-by: https://github.com/kleinesfilmroellchen ✅

Userland/Libraries/LibIPC/Message.h

@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <AK/Error.h>
 #include <AK/NonnullRefPtrVector.h>
 #include <AK/RefCounted.h>
 #include <AK/RefPtr.h>
@@ -42,6 +43,9 @@ enum class ErrorCode : u32 {
     PeerDisconnected
 };
 
+template<typename Value>
+using IPCErrorOr = ErrorOr<Value, ErrorCode>;
+
 class Message {
 public:
     virtual ~Message() = default;