Fixed possible memory leak if realloc fails. #355

Job	Run time
Ubuntu 20 GCC	1m 14s
Ubuntu GCC ASAN	4m 21s
Ubuntu GCC UBSAN	3m 30s
Ubuntu GCC MSAN	1m 53s
Ubuntu 20 Clang	1m 16s
Ubuntu 20 Clang 6.0	1m 31s
Ubuntu GCC	1m 38s
Ubuntu GCC OSB	1m 25s
Ubuntu Clang	1m 49s
Ubuntu Clang No Zlib	2m 36s
Ubuntu Clang No Bzip2	2m 4s
Ubuntu Clang No LZMA	1m 46s
Ubuntu Clang No Zstd	2m 24s
Ubuntu Clang No Pkcrypt	1m 39s
Ubuntu Clang No Winzip AES	1m 41s
Ubuntu Clang No Encryption	1m 22s
Ubuntu Clang Compress Only	1m 15s
Ubuntu Clang Decompress Only	2m 42s
Ubuntu Clang OpenSSL	1m 56s
Windows MSVC	4m 3s
Windows GCC Code Coverage	7m 21s
macOS Xcode	1m 47s
macOS Xcode Code Coverage	2m 12s
macOS Xcode LibCompression	1m 36s
macOS Xcode OpenSSL	1m 39s
	56m 40s

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