cpufreq: scpi-cpufreq: signedness bug in scpi_get_dvfs_info()

The "domain" variable needs to be signed for the error handling to work.

Fixes: 8def31034d03 (cpufreq: arm_big_little: add SCPI interface driver)
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/scpi-cpufreq.c

@@ -31,7 +31,7 @@ static struct scpi_ops *scpi_ops;
 
 static struct scpi_dvfs_info *scpi_get_dvfs_info(struct device *cpu_dev)
 {
-	u8 domain = topology_physical_package_id(cpu_dev->id);
+	int domain = topology_physical_package_id(cpu_dev->id);
 
 	if (domain < 0)
 		return ERR_PTR(-EINVAL);