soc/intel/skylake: Fix ‘dev’ pointer NULL before being dereferenced

This patch fixes KW issue due to pointer being NULL and will be dereferenced

Change-Id: Iedb59daf5f448e31c0097873a086e4d08cd4a979
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/28948
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/cpu.c

@@ -290,6 +290,10 @@ static void configure_isst(void)
 static void configure_misc(void)
 {
 	struct device *dev = SA_DEV_ROOT;
+	if (!dev) {
+		printk(BIOS_ERR, "SA_DEV_ROOT device not found!\n");
+		return;
+	}
 	config_t *conf = dev->chip_info;
 	msr_t msr;
 

src/soc/intel/skylake/thermal.c

@@ -83,6 +83,10 @@ void pch_thermal_configuration(void)
 {
 	uint16_t reg16;
 	struct device *dev = PCH_DEV_THERMAL;
+	if (!dev) {
+		printk(BIOS_ERR, "PCH_DEV_THERMAL device not found!\n");
+		return;
+	}
 	void *thermalbar = pch_thermal_get_bar(dev);
 
 	/* Use default pre-ram bar */