umc-bus.c: fix usage of device_trylock

Fix usage of device_trylock. It has the same semantics of mutex_trylock, so it
returns 1 if the lock has been acquired successfully.

Signed-off-by: Claudio Scordino <[e-mail]>
Signed-off-by: Bruno Morelli <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/uwb/umc-bus.c

···
 	struct device *parent = umc->dev.parent;
 	int ret = 0;
 
-	if (device_trylock(parent))
+	if (!device_trylock(parent))
 		return -EAGAIN;
 	ret = device_for_each_child(parent, parent, umc_bus_pre_reset_helper);
 	if (ret >= 0)