[DECNET]: Fix missing module refs in DECnet.

net/decnet/af_decnet.c

@@ -2308,6 +2308,7 @@ static int dn_socket_seq_open(struct inode *inode, struct file *file)
 }
 
 static struct file_operations dn_socket_seq_fops = {
+	.owner		= THIS_MODULE,
 	.open		= dn_socket_seq_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,

net/decnet/dn_dev.c

@@ -1443,6 +1443,7 @@ static int dn_dev_seq_open(struct inode *inode, struct file *file)
 }
 
 static struct file_operations dn_dev_seq_fops = {
+	.owner	 = THIS_MODULE,
 	.open	 = dn_dev_seq_open,
 	.read	 = seq_read,
 	.llseek	 = seq_lseek,

net/decnet/dn_route.c

@@ -1766,6 +1766,7 @@ static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
 }
 
 static struct file_operations dn_rt_cache_seq_fops = {
+	.owner	 = THIS_MODULE,
 	.open	 = dn_rt_cache_seq_open,
 	.read	 = seq_read,
 	.llseek	 = seq_lseek,