mei: gsc: remove unnecessary NULL pointer checks

The .remove() and power management callbacks are never called unless
.probe() has already returned success, which means it has set drvdata to a
non-NULL pointer, so "dev" can never be NULL in the other callbacks.

Remove the unnecessary checks.

Signed-off-by: Bjorn Helgaas <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/mei/gsc-me.c

···
 	struct mei_me_hw *hw;
 
 	dev = dev_get_drvdata(&aux_dev->dev);
-	if (!dev)
-		return;
-
 	hw = to_me_hw(dev);
 
 	mei_stop(dev);
···
 {
 	struct mei_device *dev = dev_get_drvdata(device);
 
-	if (!dev)
-		return -ENODEV;
-
 	mei_stop(dev);
 
 	mei_disable_interrupts(dev);
···
 	struct mei_aux_device *adev;
 	int err;
 	struct mei_me_hw *hw;
-
-	if (!dev)
-		return -ENODEV;
 
 	hw = to_me_hw(dev);
 	aux_dev = to_auxiliary_dev(device);
···
 {
 	struct mei_device *dev = dev_get_drvdata(device);
 
-	if (!dev)
-		return -ENODEV;
 	if (mei_write_is_idle(dev))
 		pm_runtime_autosuspend(device);
 
···
 	struct mei_device *dev = dev_get_drvdata(device);
 	struct mei_me_hw *hw;
 	int ret;
-
-	if (!dev)
-		return -ENODEV;
 
 	mutex_lock(&dev->device_lock);
 
···
 	struct mei_device *dev = dev_get_drvdata(device);
 	struct mei_me_hw *hw;
 	irqreturn_t irq_ret;
-
-	if (!dev)
-		return -ENODEV;
 
 	mutex_lock(&dev->device_lock);