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Value stored to 'err' is never read #517

Job	Run time
Ubuntu 20 GCC	44s
Ubuntu GCC ASAN	2m 17s
Ubuntu GCC UBSAN	1m 59s
Ubuntu GCC MSAN	1m 11s
Ubuntu 20 Clang	51s
Ubuntu 20 Clang 6.0	58s
Ubuntu GCC	53s
Ubuntu GCC OSB	45s
Ubuntu Clang	1m 6s
Ubuntu Clang No Zlib	55s
Ubuntu Clang No Bzip2	58s
Ubuntu Clang No LZMA	57s
Ubuntu Clang No Zstd	58s
Ubuntu Clang No Pkcrypt	56s
Ubuntu Clang No Winzip AES	44s
Ubuntu Clang No Encryption	46s
Ubuntu Clang Compress Only	1m 1s
Ubuntu Clang Decompress Only	1m 8s
Ubuntu Clang OpenSSL	52s
Windows MSVC	2m 47s
Windows GCC Code Coverage	5m 34s
macOS Xcode	42s
macOS Xcode Code Coverage	50s
macOS Xcode LibCompression	50s
macOS Xcode OpenSSL	53s
	31m 35s

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