fix warning

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index d2fdd1ce498fc99b15608be4060dac8aae0168ca..719e03ecd0882063f62315b7cfa26bf4801faa90 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit d2fdd1ce498fc99b15608be4060dac8aae0168ca
+Subproject commit 719e03ecd0882063f62315b7cfa26bf4801faa90