Fixed MSAN issue with usrsctp reliability test.
Fixed MSAN issue with usrsctp reliability test.

There is still an TSAN issues, but they are inside
usrsctp library, that's why tests are still disabled
by default.

Bug: None
Change-Id: I55f7c66b4d9a5feccd2121e2dd3b131cf1564804
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158522
Commit-Queue: Yura Yaroshevich <4f08e8762a72a25cfda60207ffb61da59ee922f4@gmail.com>
Reviewed-by: Patrik Höglund <b486136ee68458b09c92c86c39f451c87d6ef6a1@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#29640}

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