RISC-V: Fix of_node_* refcount

Fix of_node* refcount at various places by using of_node_put.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

arch/riscv/kernel/perf_event.c

@@ -476,6 +476,7 @@ int __init init_hw_perf_events(void)
 
 		if (of_id)
 			riscv_pmu = of_id->data;
+		of_node_put(node);
 	}
 
 	perf_pmu_register(riscv_pmu->pmu, "cpu", PERF_TYPE_RAW);