gen_server2: Fix return value of system_code_change/4

dumbbell · mergify[bot] · commit c6a515bfad6d · 2023-12-04T14:17:12.000Z
(cherry picked from commit 767e553)
diff --git a/deps/rabbit_common/src/gen_server2.erl b/deps/rabbit_common/src/gen_server2.erl
@@ -1113,7 +1113,7 @@ system_code_change(GS2State = #gs2_state { mod   = Mod,
         {ok, NewState} ->
             NewGS2State = find_prioritisers(
                             GS2State #gs2_state { state = NewState }),
-            {ok, [NewGS2State]};
+            {ok, NewGS2State};
         Else ->
             Else
     end.
