tests: Avoid -Wdangling-pointer warning

The code is correct, but gcc thinks the pointer is still NULL after the
call. As obvious workaround don't seem to work, just disable the warning
for now.

tests/test-fpi-device.c

@@ -29,6 +29,10 @@
 #include "test-device-fake.h"
 #include "fp-print-private.h"
 
+/* gcc 12.0.1 is complaining about dangling pointers in the auto_close* functions */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdangling-pointer"
+
 /* Utility functions */
 
 typedef FpDevice FpAutoCloseDevice;
@@ -65,6 +69,8 @@ auto_close_fake_device_free (FpAutoCloseDevice *device)
 }
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (FpAutoCloseDevice, auto_close_fake_device_free)
 
+#pragma GCC diagnostic pop
+
 typedef FpDeviceClass FpAutoResetClass;
 static FpAutoResetClass default_fake_dev_class = {0};