drm/sched: Increment job count before swapping tail spsc queue

In the Linux kernel, the following vulnerability has been resolved:

drm/sched: Increment job count before swapping tail spsc queue

A small race exists between spsc_queue_push and the run-job worker, in

which spsc_queue_push may return not-first while the run-job worker has

already idled due to the job count being zero. If this race occurs, job

scheduling stops, leading to hangs while waiting on the job’s DMA

fences.

Seal this race by incrementing the job count before appending to the

SPSC queue.

This race was observed on a drm-tip 6.16-rc1 build with the Xe driver in

an SVM test case.