Finish reformatting RTCPUtility::RTCPParserV2::Validate()
Finish reformatting RTCPUtility::RTCPParserV2::Validate()

Half of the function's code was reformatted and reindented in
https://codereview.webrtc.org/1307663004, but the bottom half was still
adhering to an old coding style and using different indentation values.

Not only does this make the code look confusing, but it can cause build
issues on certain compilers: for example, GCC 6.2.0 with -Wall causes
the build to fail because -Wmisleading-indentation is enabled.

BUG=None
R=asapersson@webrtc.org,danilchap@webrtc.org

Review-Url: https://codereview.webrtc.org/2479193002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#14957}

TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc