http2: avoid strstr() on data not zero terminated
It's not strictly clear if the API contract allows us to call strstr() on a string that isn't zero terminated even when we know it will find the substring, and clang's ASAN check dislikes us for it. Also added a check of the return code in case it fails, even if I can't think of a situation how that can trigger. Detected by OSS-Fuzz Closes #2513 Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7760
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