drm/radeon/kms: remove stray radeon_i2c_destroy

I missed this one in the i2c unification patch.  This
is handled in the core radeon i2c code now.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_pm.c

@@ -637,8 +637,6 @@ void radeon_pm_fini(struct radeon_device *rdev)
 	}
 
 	radeon_hwmon_fini(rdev);
-	if (rdev->pm.i2c_bus)
-		radeon_i2c_destroy(rdev->pm.i2c_bus);
 }
 
 void radeon_pm_compute_clocks(struct radeon_device *rdev)