Remove memcheck suppression for TestOpusDtx

Bug: webrtc:5986
Change-Id: I1cd7e5be459f77dcb3b52f9dff686dc50d53636d
Reviewed-on: https://webrtc-review.googlesource.com/5600
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Commit-Queue: Felicia Lim <flim@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20123}
diff --git a/tools_webrtc/valgrind/memcheck/suppressions.txt b/tools_webrtc/valgrind/memcheck/suppressions.txt
index ba7c314..75b1ce6 100644
--- a/tools_webrtc/valgrind/memcheck/suppressions.txt
+++ b/tools_webrtc/valgrind/memcheck/suppressions.txt
@@ -427,14 +427,6 @@
    ...
 }
 {
-   bug_5986
-   Memcheck:Unaddressable
-   fun:silk_stereo_LR_to_MS
-   fun:silk_Encode
-   fun:opus_encode_native
-   ...
-}
-{
    bug_5987
    Memcheck:Leak
    fun:_Znw*