disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/drivers/gpu/drm/nouveau/nvkm/core/memory.c
..
..
@@ -140,7 +140,7 @@
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 {
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 	struct nvkm_instmem *imem = device->imem;
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 	struct nvkm_memory *memory;
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-	int ret = -ENOSYS;
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+	int ret;
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 	if (unlikely(target != NVKM_MEM_TARGET_INST || !imem))
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 		return -ENOSYS;