Windows driver fix: Decrement IoThreadPendingRequestCount on allocation failure in MainThreadProc

Added InterlockedDecrement in the error path when GetPoolBuffer fails for EncryptedIoRequest to ensure accurate tracking of pending IO requests and prevent potential resource leaks.

src/Driver/EncryptedIoQueue.c

@@ -1046,6 +1046,7 @@ static VOID MainThreadProc (PVOID threadArg)
 				request = GetPoolBuffer (queue, sizeof (EncryptedIoRequest));
 				if (!request)
 				{
+					InterlockedDecrement(&queue->IoThreadPendingRequestCount);
 					CompleteOriginalIrp (item, STATUS_INSUFFICIENT_RESOURCES, 0);
 					break;
 				}