In ip6_mfib_forward_rpf_node,is_v4 should be 0.

Change-Id: I9de63cebfcef8898d0ea4c9c2b7451b168b06c2c
Signed-off-by: mu.duojiao <mu.duojiao@zte.com.cn>
diff --git a/src/vnet/mfib/mfib_forward.c b/src/vnet/mfib/mfib_forward.c
index c5e1dfc..e02c1d8 100644
--- a/src/vnet/mfib/mfib_forward.c
+++ b/src/vnet/mfib/mfib_forward.c
@@ -497,7 +497,7 @@
                       vlib_node_runtime_t * node,
                       vlib_frame_t * frame)
 {
-    return (mfib_forward_rpf(vm, node, frame, 1));
+    return (mfib_forward_rpf(vm, node, frame, 0));
 }