drm/amd/amdgpu: amdgpu_hwmon_show_temp: initialize temp

Reported by smatch:
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c:1496 amdgpu_hwmon_show_temp() error: uninitialized symbol 'temp'.
Signed-off-by: Ernst Sjöstrand <ernstp@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1462,7 +1462,7 @@ static ssize_t amdgpu_hwmon_show_temp(struct device *dev,
 	struct amdgpu_device *adev = dev_get_drvdata(dev);
 	struct drm_device *ddev = adev->ddev;
 	int channel = to_sensor_dev_attr(attr)->index;
-	int r, temp, size = sizeof(temp);
+	int r, temp = 0, size = sizeof(temp);
 
 	/* Can't get temperature when the card is off */
 	if  ((adev->flags & AMD_IS_PX) &&