fuse: fix possibly missing fuse_copy_finish() call in fuse_notify()

jira SECO-478
BUGFIX: FUSE
commit-author Miklos Szeredi <mszeredi@redhat.com>
commit 0b563aa

In case of FUSE_NOTIFY_RESEND and FUSE_NOTIFY_INC_EPOCH fuse_copy_finish()
isn't called.

Fix by always calling fuse_copy_finish() after fuse_notify().  It's a no-op
if called a second time.

Fixes: 760eac7 ("fuse: Introduce a new notification type for resend pending requests")
Fixes: 2396356 ("fuse: add more control over cache invalidation behaviour")
	Cc: <stable@vger.kernel.org> # v6.9
	Reviewed-by: Joanne Koong <joannelkoong@gmail.com>
	Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
(cherry picked from commit 0b563aa)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

fs/fuse/dev.c

@@ -2005,7 +2005,7 @@ static ssize_t fuse_dev_do_write(struct fuse_dev *fud,
 	 */
 	if (!oh.unique) {
 		err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), cs);
-		goto out;
+		goto copy_finish;
 	}
 
 	err = -EINVAL;