drm/xe: Remove unrequired NULL checks in xe_sync_entry_cleanup

dma_fence_put() and dma_fence_chain_free() can handle NULL input,
there is no need for NULL check by caller.

Signed-off-by: Himal Prasad Ghimiray <[e-mail]>
Reviewed-by: Matthew Brost <[e-mail]>
Reviewed-by: Nirmoy Das <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Nirmoy Das <[e-mail]>

drivers/gpu/drm/xe/xe_sync.c

···
 {
 	if (sync->syncobj)
 		drm_syncobj_put(sync->syncobj);
-	if (sync->fence)
-		dma_fence_put(sync->fence);
-	if (sync->chain_fence)
-		dma_fence_chain_free(sync->chain_fence);
+	dma_fence_put(sync->fence);
+	dma_fence_chain_free(sync->chain_fence);
 	if (sync->ufence)
 		user_fence_put(sync->ufence);
 }