Remove always-true expression.

TBR=pbos

Review URL: https://webrtc-codereview.appspot.com/16059004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6668 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc b/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc
index 360176b..9c04c25 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_format_vp8.cc
@@ -420,7 +420,7 @@
   *data_field = 0;
   if (TIDFieldPresent()) {
     *x_field |= kTBit;
-    assert(hdr_info_.temporalIdx >= 0 && hdr_info_.temporalIdx <= 3);
+    assert(hdr_info_.temporalIdx <= 3);
     *data_field |= hdr_info_.temporalIdx << 6;
     *data_field |= hdr_info_.layerSync ? kYBit : 0;
   }