[qca-nss-ecm]: Fix for "to_interface" deref in Multicast

The multicast "to_interfaces" were dereferenced wrongly which was causing
Interface delete for IPv6.

Change-Id: I0340fc15c193e8b9034b731d29b6c9545eac9646
Signed-off-by: Suman Ghosh <sumaghos@codeaurora.org>
2 files changed