GetStreamCaps can return S_FALSE, which is not caught by FAILED().
Instead it is necessary to compare for equality with S_OK.
Bug: webrtc:10267
Change-Id: I4113ef5544f830f5cb5f09f143dff43129993d3d
Reviewed-on: https://webrtc-review.googlesource.com/c/120644
Commit-Queue: Dan Minor <dminor@webrtc.org>
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26539}