net/can: single_open_net needs to be paired with single_release_net

Otherwise we will leak a reference to the network namespace.

Signed-off-by: Christoph Hellwig <hch@lst.de>

net/can/bcm.c

@@ -249,7 +249,7 @@ static const struct file_operations bcm_proc_fops = {
 	.open		= bcm_proc_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
-	.release	= single_release,
+	.release	= single_release_net,
 };
 #endif /* CONFIG_PROC_FS */