driver core: fix driver_match_device

This patch fixes a bug introduced in commit
49b420a13ff95b449947181190b08367348e3e1b.

If a instance of bus_type doesn't have .match method,
all .probe of drivers in the bus should be called, or else
the .probe have not a chance to be called.

Signed-off-by: Ming Lei <[e-mail]>
Reported-by: Guennadi Liakhovetski <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/base/base.h

···
 static inline int driver_match_device(struct device_driver *drv,
 				      struct device *dev)
 {
-	return drv->bus->match && drv->bus->match(dev, drv);
+	return drv->bus->match ? drv->bus->match(dev, drv) : 1;
 }
 
 extern void sysdev_shutdown(void);