wpan-phy: init channel/page fields

Set page to zero (for compatibility w/ devices supporting only first page).
Also init channel by default to -1 to disallow transfers for non-initialised
devices.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
diff --git a/net/ieee802154/wpan-class.c b/net/ieee802154/wpan-class.c
index 0cec138..a10ae5b 100644
--- a/net/ieee802154/wpan-class.c
+++ b/net/ieee802154/wpan-class.c
@@ -143,6 +143,9 @@
 
 	phy->dev.class = &wpan_phy_class;
 
+	phy->current_channel = -1; /* not initialised */
+	phy->current_page = 0; /* for compatibility */
+
 	return phy;
 }
 EXPORT_SYMBOL(wpan_phy_alloc);