dma_fence:  less assert in dma_fence_wait() for reality

dma_fence_wait_timeout() can return fence-specific value from the
fence ops "wait" callback, which may reduce the value of "timeout"
upon return, from the initial MAX_SCHEDULE_TIMEOUT.  allow the
return value to be -ERESTARTSYS, or anywhere from 1 to the initial
value.

fixes a crash when trying to "mpv" on radeon/OLAND.


diff --git a/sys/external/bsd/drm2/linux/linux_dma_fence.c b/sys/external/bsd/drm2/linux/linux_dma_fence.c
index d40d3abb1377..e2bbe0a1bf5f 100644
--- a/sys/external/bsd/drm2/linux/linux_dma_fence.c
+++ b/sys/external/bsd/drm2/linux/linux_dma_fence.c
@@ -997,7 +997,7 @@ dma_fence_wait(struct dma_fence *fence, bool intr)
 
 	ret = dma_fence_wait_timeout(fence, intr, MAX_SCHEDULE_TIMEOUT);
 	KASSERT(ret != 0);
-	KASSERTMSG(ret == -ERESTARTSYS || ret == MAX_SCHEDULE_TIMEOUT,
+	KASSERTMSG(ret == -ERESTARTSYS || (ret > 0 && ret <= MAX_SCHEDULE_TIMEOUT),
 	    "ret=%ld", ret);
 
 	return (ret < 0 ? ret : 0);