mvebu: add fix for armada 37xx cpufreq driver

Backport from stable kernel tree fixing clock leak.

Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>

target/linux/mvebu/patches-4.14/508-cpufreq-armada-37xx-Fix-clock-leak.patch

@@ -0,0 +1,35 @@
+From bbcc328561040292f7d6796954d478e4a2335e6f Mon Sep 17 00:00:00 2001
+From: Gregory CLEMENT <gregory.clement@bootlin.com>
+Date: Wed, 4 Apr 2018 16:44:44 +0200
+Subject: [PATCH] cpufreq: armada-37xx: Fix clock leak
+
+There was no clk_put() balancing the clk_get(). This commit fixes it.
+
+Fixes: 92ce45fb875d (cpufreq: Add DVFS support for Armada 37xx)
+Cc: 4.16+ <stable@vger.kernel.org> # 4.16+
+Reported-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
+Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
+Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+---
+ drivers/cpufreq/armada-37xx-cpufreq.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/cpufreq/armada-37xx-cpufreq.c
++++ b/drivers/cpufreq/armada-37xx-cpufreq.c
+@@ -202,6 +202,7 @@ static int __init armada37xx_cpufreq_dri
+ 	cur_frequency = clk_get_rate(clk);
+ 	if (!cur_frequency) {
+ 		dev_err(cpu_dev, "Failed to get clock rate for CPU\n");
++		clk_put(clk);
+ 		return -EINVAL;
+ 	}
+ 
+@@ -210,6 +211,7 @@ static int __init armada37xx_cpufreq_dri
+ 		return -EINVAL;
+ 
+ 	armada37xx_cpufreq_dvfs_setup(nb_pm_base, clk, dvfs->divider);
++	clk_put(clk);
+ 
+ 	for (load_lvl = ARMADA_37XX_DVFS_LOAD_0; load_lvl < LOAD_LEVEL_NR;
+ 	     load_lvl++) {