cpufreq: st: add missing \n to end of dev_err message

Trival fix, dev_err message is missing a \n, so add it.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Acked-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/sti-cpufreq.c

@@ -163,7 +163,7 @@ static int sti_cpufreq_set_opp_info(void)
 
 	reg_fields = sti_cpufreq_match();
 	if (!reg_fields) {
-		dev_err(dev, "This SoC doesn't support voltage scaling");
+		dev_err(dev, "This SoC doesn't support voltage scaling\n");
 		return -ENODEV;
 	}