Fix upgrade async with cork

src/AsyncSocket.h

@@ -141,11 +141,6 @@ protected:
         getLoopData()->corkedSocket = this;
     }
 
-    /* Returns the corked socket or nullptr */
-    void *corkedSocket() {
-        return getLoopData()->corkedSocket;
-    }
-
     /* Returns wheter we are corked or not */
     bool isCorked() {
         return getLoopData()->corkedSocket == this;

src/HttpResponse.h

@@ -496,13 +496,14 @@ public:
     /* Corks the response if possible. Leaves already corked socket be. */
     HttpResponse *cork(MoveOnlyFunction<void()> &&handler) {
         if (!Super::isCorked() && Super::canCork()) {
+            LoopData *loopData = Super::getLoopData();
             Super::cork();
             handler();
 
             /* The only way we could possibly have changed the corked socket during handler call, would be if 
              * the HTTP socket was upgraded to WebSocket and caused a realloc. Because of this we cannot use "this"
              * from here downwards. The corking is done with corkUnchecked() in upgrade. It steals cork. */
-            auto *newCorkedSocket = Super::corkedSocket();
+            auto *newCorkedSocket = loopData->corkedSocket;
 
             /* If nobody is corked, it means most probably that large amounts of data has
              * been written and the cork buffer has already been sent off and uncorked.