PM ref underflow on TGL driver unload

No display...

root@DUT025-TGLU:mbrost# modprobe xe
root@DUT025-TGLU:mbrost# dmesg --clear
root@DUT025-TGLU:mbrost# rmmod xe
root@DUT025-TGLU:mbrost# dmesg
[  312.290109] xe 0000:00:02.0: [drm] GT resumed
[  312.293196] xe 0000:00:02.0: Runtime PM usage count underflow!