netfilter: xt_qtaguid: Protect iface list access with necessary lock

This fixes a bug where the list is accessed without a lock,
potentially causing corruption when there is a race.

Change-Id: I084dcadb537de00a4be6fa09e31ec693443d3986
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>
1 file changed