driver core: add missing blank line after declaration

Found using checkpatch.pl
Signed-off-by: NLavinia Tache <lavinia.tachee@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/driver.c

@@ -103,6 +103,7 @@ int driver_create_file(struct device_driver *drv,
 		       const struct driver_attribute *attr)
 {
 	int error;
+
 	if (drv)
 		error = sysfs_create_file(&drv->p->kobj, &attr->attr);
 	else