drm/msm/adreno: Use kvmemdup to simplify the code

Use kvmemdup instead of kvmalloc() + memcpy() to simplify the code.

No functional change intended.
Signed-off-by: Li Zetao <lizetao1@huawei.com>
Reviewed-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/609596/Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/adreno/adreno_gpu.c

@@ -688,11 +688,9 @@ int adreno_gpu_state_get(struct msm_gpu *gpu, struct msm_gpu_state *state)
 				size = j + 1;
 
 		if (size) {
-			state->ring[i].data = kvmalloc(size << 2, GFP_KERNEL);
-			if (state->ring[i].data) {
-				memcpy(state->ring[i].data, gpu->rb[i]->start, size << 2);
+			state->ring[i].data = kvmemdup(gpu->rb[i]->start, size << 2, GFP_KERNEL);
+			if (state->ring[i].data)
 				state->ring[i].data_size = size << 2;
-			}
 		}
 	}