* Do not delete the device handed over to the devfs when deleting the vnode

as it seems devfs should not take over ownership. The device is deleted
  in republish_driver for legacy drivers before the call to devfs_unpublish_device
  that in turn deletes the vnode. This looks generally suspicious to me as
  the device pointer the devfs vnode may still use gets invalid for a certain
  amount of time (until the node is unpublished). So maybe the devfs should
  take ownership of the device afterall and it shouldn't be deleted by the
  device_manager/legacy driver functions. Axel please review.
* Do not try to delete the IOScheduler for now as creating one is disabled
  currently too.

This fixes the crash on rescans of legacy drivers as seen when unplugging
USB devices.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25729 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/device_manager/devfs.cpp

@@ -255,8 +255,9 @@ devfs_delete_vnode(struct devfs* fs, struct devfs_vnode* vnode,
 			put_vnode(fs->volume,
 				vnode->stream.u.dev.partition->raw_device->id);
 		} else {
+#if 0
 			delete vnode->stream.u.dev.scheduler;
-			delete vnode->stream.u.dev.device;
+#endif
 		}
 	}