Bluetooth: Replace sprintf with snprintf

Change will replace sprintf with snprintf, since sprintf is a
banned function.

CRs-FIxed: 548220
Change-Id: I32f5ab1f3707e5bbe43c31a7ad4611b67557b267
Signed-off-by: Juffin Alex Varghese <jalex@codeaurora.org>
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 9962c88..6c78c0c 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -1457,7 +1457,7 @@
 		head = p; id++;
 	}
 
-	sprintf(hdev->name, "hci%d", id);
+	snprintf(hdev->name, sizeof(hdev->name), "hci%d", id);
 	hdev->id = id;
 	list_add(&hdev->list, head);