clocksource/drivers/riscv: Add required checks during clock source init

	struct clocksource *cs;

	hartid = riscv_of_processor_hartid(n);

	if (hartid < 0) {

		pr_warn("Not valid hartid for node [%pOF] error = [%d]\n",

			n, hartid);

		return hartid;

	}

	cpuid = riscv_hartid_to_cpuid(hartid);

	if (cpuid < 0) {

		pr_warn("Invalid cpuid for hartid [%d]\n", hartid);

		return cpuid;

	}

	if (cpuid != smp_processor_id())

		return 0;

	pr_info("%s: Registering clocksource cpuid [%d] hartid [%d]\n",

	       __func__, cpuid, hartid);

	cs = per_cpu_ptr(&riscv_clocksource, cpuid);

	clocksource_register_hz(cs, riscv_timebase);

	error = clocksource_register_hz(cs, riscv_timebase);

	if (error) {

		pr_err("RISCV timer register failed [%d] for cpu = [%d]\n",

		       error, cpuid);

		return error;

	}

	sched_clock_register(riscv_sched_clock,

			BITS_PER_LONG, riscv_timebase);

			 "clockevents/riscv/timer:starting",

			 riscv_timer_starting_cpu, riscv_timer_dying_cpu);

	if (error)

		pr_err("RISCV timer register failed [%d] for cpu = [%d]\n",

		       error, cpuid);

		pr_err("cpu hp setup state failed for RISCV timer [%d]\n",

		       error);

	return error;

}