CNG fuzzer: avoid long fuzzer runs by limiting generator calls
CNG fuzzer: avoid long fuzzer runs by limiting generator calls

The number of calls to ComfortNoiseDecoder::Generate() was determined
by the fuzzer input, and was chosen between 0 and 255. This would
sometimes lead to very long runs, with questionable merit. With this
change, the number of call to Generate() is limited to 17 (an
arbitrary small integer).

Bug: chromium:820078
Change-Id: I27b5c7f0b72d53370d002a6b157d4451079a0ba9
Reviewed-on: https://webrtc-review.googlesource.com/60941
Reviewed-by: Alex Loiko <999d0b481e5703ad7006f0848e249f8b2c3f29bd@webrtc.org>
Commit-Queue: Henrik Lundin <b9599afb29b1fa4305dba8bb04f760bf0c9c9471@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#22360}
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