OSV-2020-1659 Use-of-uninitialized-value in LibRaw::parse_sinar_ia

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25188 Crash type: Use-of-uninitialized-value Crash state: LibRaw::parsesinaria LibRaw::identify LibRaw::opendatastream...