kcm: remove redundant -ve error check and return path

The check for a -ve error is redundant, remove it and just
immediately return the return value from the call to
seq_open_net.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/kcm/kcmproc.c

@@ -88,13 +88,9 @@ struct kcm_proc_mux_state {
 static int kcm_seq_open(struct inode *inode, struct file *file)
 {
 	struct kcm_seq_muxinfo *muxinfo = PDE_DATA(inode);
-	int err;
 
-	err = seq_open_net(inode, file, &muxinfo->seq_ops,
+	return seq_open_net(inode, file, &muxinfo->seq_ops,
 			   sizeof(struct kcm_proc_mux_state));
-	if (err < 0)
-		return err;
-	return err;
 }
 
 static void kcm_format_mux_header(struct seq_file *seq)