saner FASYNC handling on file close

As it is, all instances of ->release() for files that have ->fasync()
need to remember to evict file from fasync lists; forgetting that
creates a hole and we actually have a bunch that *does* forget.

So let's keep our lives simple - let __fput() check FASYNC in
file->f_flags and call ->fasync() there if it's been set.  And lose that
crap in ->release() instances - leaving it there is still valid, but we
don't have to bother anymore.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/input/mousedev.c

@@ -519,7 +519,6 @@ static int mousedev_release(struct inode *inode, struct file *file)
 	struct mousedev_client *client = file->private_data;
 	struct mousedev *mousedev = client->mousedev;
 
-	mousedev_fasync(-1, file, 0);
 	mousedev_detach_client(mousedev, client);
 	kfree(client);