fix: Early free of device nodes in AcpiDtbSsdtGenerator

If the initial callback is called before ACPI protocols are ready,
the device nodes are freed before they are processed. This change
returns in this case instead of going to the cleanup code.

Fixes github issue #116
Bug 5079045

Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>

Silicon/NVIDIA/Drivers/AcpiDtbSsdtGenerator/AcpiDtbSsdtGenerator.c

@@ -340,7 +340,7 @@ AcpiProtocolReady (
 
   Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **)&AcpiTableProtocol);
   if (EFI_ERROR (Status)) {
-    goto Cleanup;
+    return;
   }
 
   gBS->CloseEvent (Event);