drm/i915: Increment composite fence seqno

Increment composite fence seqno on each fence creation.

Fixes: 544460c3 ("drm/i915: Multi-BB execbuf")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211214195913.35735-1-matthew.brost@intel.com

drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c

@@ -3150,7 +3150,7 @@ eb_composite_fence_create(struct i915_execbuffer *eb, int out_fence_fd)
 	fence_array = dma_fence_array_create(eb->num_batches,
 					     fences,
 					     eb->context->parallel.fence_context,
-					     eb->context->parallel.seqno,
+					     eb->context->parallel.seqno++,
 					     false);
 	if (!fence_array) {
 		kfree(fences);