PM / OPP: add missing of_node_put() for of_get_cpu_node()

Commit 762792913f8c (PM / OPP: Fix get sharing CPUs when hotplug
is used) moved away from using cpu_dev->of_node because of some
limitations.

However, commit 7467c9d95989 (of: return of_get_cpu_node from
of_cpu_device_node_get if CPUs are not registered) added support to
fall back to of_get_cpu_node() if called if CPUs are not registered
yet.

Add the missing of_node_put() for the CPU device nodes. Also go back
to using of_cpu_device_node_get() in dev_pm_opp_of_get_sharing_cpus()
to avoid scanning the device tree again.

Acked-by: Viresh Kumar <[e-mail]>
Fixes: 762792913f8c (PM / OPP: Fix get sharing CPUs when hotplug is used)
Signed-off-by: Sudeep Holla <[e-mail]>
Reviewed-by: Stephen Boyd <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/opp/of.c

···
 #include <linux/cpu.h>
 #include <linux/errno.h>
 #include <linux/device.h>
-#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/slab.h>
 #include <linux/export.h>
 
···
 		if (cpu == cpu_dev->id)
 			continue;
 
-		cpu_np = of_get_cpu_node(cpu, NULL);
+		cpu_np = of_cpu_device_node_get(cpu);
 		if (!cpu_np) {
 			dev_err(cpu_dev, "%s: failed to get cpu%d node\n",
 				__func__, cpu);
···
 
 		/* Get OPP descriptor node */
 		tmp_np = _opp_of_get_opp_desc_node(cpu_np);
+		of_node_put(cpu_np);
 		if (!tmp_np) {
 			pr_err("%pOF: Couldn't find opp node\n", cpu_np);
 			ret = -ENOENT;