[SUNRPC]: cleanup: use seq_release_private() where appropriate

We can save some lines of code by using seq_release_private().
Signed-off-by: Martin Peschke <mp3@de.ibm.com>
Acked-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sunrpc/cache.c

@@ -1237,20 +1237,12 @@ static int content_open(struct inode *inode, struct file *file)
 
 	return res;
 }
-static int content_release(struct inode *inode, struct file *file)
-{
-	struct seq_file *m = (struct seq_file *)file->private_data;
-	struct handle *han = m->private;
-	kfree(han);
-	m->private = NULL;
-	return seq_release(inode, file);
-}
 
 static const struct file_operations content_file_operations = {
 	.open		= content_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
-	.release	= content_release,
+	.release	= seq_release_private,
 };
 
 static ssize_t read_flush(struct file *file, char __user *buf,