[Bluetooth] Remove global conf_mtu variable from L2CAP

After the change to the L2CAP configuration parameter handling the
global conf_mtu variable is no longer needed and so remove it.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 6ce693d..fde1606 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -508,7 +508,6 @@
 
 	/* Default config options */
 	pi->conf_len = 0;
-	pi->conf_mtu = L2CAP_DEFAULT_MTU;
 	pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
 }
 
@@ -1256,11 +1255,11 @@
 		break;
 
 	case 2:
-		*val = __le16_to_cpu(*((__le16 *)opt->val));
+		*val = __le16_to_cpu(*((__le16 *) opt->val));
 		break;
 
 	case 4:
-		*val = __le32_to_cpu(*((__le32 *)opt->val));
+		*val = __le32_to_cpu(*((__le32 *) opt->val));
 		break;
 
 	default:
@@ -1332,6 +1331,7 @@
 	int len = pi->conf_len;
 	int type, hint, olen;
 	unsigned long val;
+	u16 mtu = L2CAP_DEFAULT_MTU;
 	u16 result = L2CAP_CONF_SUCCESS;
 
 	BT_DBG("sk %p", sk);
@@ -1344,7 +1344,7 @@
 
 		switch (type) {
 		case L2CAP_CONF_MTU:
-			pi->conf_mtu = val;
+			mtu = val;
 			break;
 
 		case L2CAP_CONF_FLUSH_TO:
@@ -1368,10 +1368,10 @@
 		/* Configure output options and let the other side know
 		 * which ones we don't like. */
 
-		if (pi->conf_mtu < pi->omtu)
+		if (mtu < pi->omtu)
 			result = L2CAP_CONF_UNACCEPT;
 		else {
-			pi->omtu = pi->conf_mtu;
+			pi->omtu = mtu;
 			pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
 		}