cpufreq: sun50i: Switch to use dev_err_probe() helper

In the probe path, convert pr_err() to dev_err_probe() which will
check if error code is -EPROBE_DEFER and prints the error name.
It also sets the defer probe reason which can be checked later
through debugfs. It's more simple in error path.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/sun50i-cpufreq-nvmem.c

@@ -56,12 +56,9 @@ static int sun50i_cpufreq_get_efuse(u32 *versions)
 
 	speedbin_nvmem = of_nvmem_cell_get(np, NULL);
 	of_node_put(np);
-	if (IS_ERR(speedbin_nvmem)) {
-		if (PTR_ERR(speedbin_nvmem) != -EPROBE_DEFER)
-			pr_err("Could not get nvmem cell: %ld\n",
-			       PTR_ERR(speedbin_nvmem));
-		return PTR_ERR(speedbin_nvmem);
-	}
+	if (IS_ERR(speedbin_nvmem))
+		return dev_err_probe(cpu_dev, PTR_ERR(speedbin_nvmem),
+				     "Could not get nvmem cell\n");
 
 	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
 	nvmem_cell_put(speedbin_nvmem);