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If srtp_create fails while adding streams, it deallocates the session but doesn't clear the passed pointer which then could lead to a double-free in the SrtpSession dtor. The CL also adds locking for libsrtp initialization / shutdown. BUG=4042 R=jiayl@webrtc.org, juberti@google.com, pthatcher@webrtc.org Review URL: https://webrtc-codereview.appspot.com/47319004 Cr-Commit-Position: refs/heads/master@{#9300}