drm/amd/pm: fix error flow in sensor fetching

Sensor fetching functions should return an signed int to
handle errors properly.
Reviewed-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reported-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/amdgpu_pm.c

@@ -1467,7 +1467,7 @@ static ssize_t amdgpu_set_pp_power_profile_mode(struct device *dev,
 	return -EINVAL;
 }
 
-static unsigned int amdgpu_hwmon_get_sensor_generic(struct amdgpu_device *adev,
+static int amdgpu_hwmon_get_sensor_generic(struct amdgpu_device *adev,
 					   enum amd_pp_sensors sensor,
 					   void *query)
 {
@@ -2772,7 +2772,7 @@ static ssize_t amdgpu_hwmon_show_vddnb_label(struct device *dev,
 	return sysfs_emit(buf, "vddnb\n");
 }
 
-static unsigned int amdgpu_hwmon_get_power(struct device *dev,
+static int amdgpu_hwmon_get_power(struct device *dev,
 				  enum amd_pp_sensors sensor)
 {
 	struct amdgpu_device *adev = dev_get_drvdata(dev);
@@ -2794,7 +2794,7 @@ static ssize_t amdgpu_hwmon_show_power_avg(struct device *dev,
 					   struct device_attribute *attr,
 					   char *buf)
 {
-	unsigned int val;
+	int val;
 
 	val = amdgpu_hwmon_get_power(dev, AMDGPU_PP_SENSOR_GPU_AVG_POWER);
 	if (val < 0)
@@ -2807,7 +2807,7 @@ static ssize_t amdgpu_hwmon_show_power_input(struct device *dev,
 					     struct device_attribute *attr,
 					     char *buf)
 {
-	unsigned int val;
+	int val;
 
 	val = amdgpu_hwmon_get_power(dev, AMDGPU_PP_SENSOR_GPU_INPUT_POWER);
 	if (val < 0)