Dan Minor b164e70450 Check that data_ is non-null before memcpy in EnsureCapacityWithHeadroom
Since we've passed IsConsistent(), if data_ is null, size_ must be
zero, so we might attempt to copy zero bytes from a nullptr.  This does
not seem to cause problems in practice, but is still undefined
behaviour. This was caught on an UBsan test run in Firefox.

Bug: webrtc:11613
Change-Id: Iad795bf19ed69b56e066958a54a7e3a434b996cf
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176280
Commit-Queue: Dan Minor <dminor@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31386}
2020-05-29 11:42:06 +00:00
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