musa: fix build warning (#13129)

Signed-off-by: Xiaodong Ye <xiaodong.ye@mthreads.com>

ggml/src/ggml-cuda/cpy.cu

@@ -639,6 +639,8 @@ void ggml_cuda_cpy(ggml_backend_cuda_context & ctx, const ggml_tensor * src0, gg
     if(ctx.cuda_graph->use_cpy_indirection && !disable_indirection_for_this_node) {
         ctx.cuda_graph->graph_cpynode_index = graph_cpynode_index;
     }
+#else
+    GGML_UNUSED(disable_indirection_for_this_node);
 #endif
 
 }