Input: serio - drop warnings in case of EPROBE_DEFER from serio_find_driver()

Now serio_find_driver() will print warnings in case device_attach()
returns -EPROBE_DEFER. Those warnings are obsolete, in genral, because:
- DD core can report the same if required
- since commit 013c074f86 ("PM / sleep: prohibit devices probing
during suspend/hibernation") the devices probing is prohibited during
System suspend and deferred device will be carefully reprobed once
Resume is finished.

Hence, drop warnings in case of EPROBE_DEFER from serio_find_driver().

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/serio/serio.c

@@ -134,7 +134,7 @@ static void serio_find_driver(struct serio *serio)
 	int error;
 
 	error = device_attach(&serio->dev);
-	if (error < 0)
+	if (error < 0 && error != -EPROBE_DEFER)
 		dev_warn(&serio->dev,
 			 "device_attach() failed for %s (%s), error: %d\n",
 			 serio->phys, serio->name, error);