hashsum/b2sum: when the checksum file is untagged, detect the size #3480

Job	Run time
Build the fuzzers	1m 51s
Run the fuzzers (fuzz_test, true)	4m 18s
Run the fuzzers (fuzz_date, false)	4m 2s
Run the fuzzers (fuzz_expr, true)	4m 12s
Run the fuzzers (fuzz_printf, false)	3m 7s
Run the fuzzers (fuzz_echo, true)	4m 11s
Run the fuzzers (fuzz_seq, false)	1m 21s
Run the fuzzers (fuzz_sort, false)	3m 42s
Run the fuzzers (fuzz_wc, false)	1m 23s
Run the fuzzers (fuzz_cut, false)	3m 10s
Run the fuzzers (fuzz_split, false)	1m 52s
Run the fuzzers (fuzz_tr, false)	3m 20s
Run the fuzzers (fuzz_env, false)	3m 15s
Run the fuzzers (fuzz_parse_glob, true)	4m 2s
Run the fuzzers (fuzz_parse_size, true)	4m 7s
Run the fuzzers (fuzz_parse_time, true)	4m 7s
Run the fuzzers (fuzz_seq_parse_number, true)	4m 0s
	56m 0s

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