LibTextCodec: Make UTF16BEDecoder read only up to an even offset #5802
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Reading up to the end of the input string of odd length results in an out-of-bounds read. (this fixes #5769)
FuzzUTF16BEDecoder is one of the 3 fuzzers that are crashing on the majority of cases fed to them by oss-fuzz (50% in this case assuming even distribution of input lengths :p), causing oss-fuzz to assume a failing build, so this is the first part of 3 to eventually making #5682 build again.