Fix infinite loop bug with UnflectAPI rollback

sources/BaseAPI/API/Unflect/UnflectApi.uc

@@ -67,6 +67,7 @@ public final function _drop() {
     // Drop is called when Acedia is shutting down, so releasing references isn't necessary
     iter = HashTableIterator(completedReplacements.Iterate());
     while (!iter.HasFinished()) {
+        nextFunctionInstance = none;
         nextFunctionName = Text(iter.GetKey());
         nextSources = ByteArrayBox(originalScriptCodes.GetItem(nextFunctionName));
         if (nextSources != none ) {
@@ -75,6 +76,7 @@ public final function _drop() {
         if (nextFunctionInstance != none) {
             nextFunctionInstance.script = nextSources.Get();
         }
+        iter.Next();
     }
 }