- fix text_received() callback so that it can work without date header.

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index fd8f21d7087ed2d5af18e4cd3a7db9bdf0008ed3..6251dea54272cf048c580e03a80c67d672367f2a 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit fd8f21d7087ed2d5af18e4cd3a7db9bdf0008ed3
+Subproject commit 6251dea54272cf048c580e03a80c67d672367f2a