Fix coverage files generation #6619

Job	Run time
Build the fuzzers	2m 26s
Run the fuzzers (fuzz_test, true)	2m 59s
Run the fuzzers (fuzz_date, false)	2m 22s
Run the fuzzers (fuzz_expr, true)	2m 48s
Run the fuzzers (fuzz_printf, false)	2m 48s
Run the fuzzers (fuzz_echo, true)	2m 58s
Run the fuzzers (fuzz_seq, false)	2m 15s
Run the fuzzers (fuzz_sort, false)	2m 30s
Run the fuzzers (fuzz_wc, false)	1m 52s
Run the fuzzers (fuzz_cut, false)	1m 57s
Run the fuzzers (fuzz_split, false)	2m 5s
Run the fuzzers (fuzz_tr, false)	2m 2s
Run the fuzzers (fuzz_env, false)	1m 51s
Run the fuzzers (fuzz_cksum, false)	1m 54s
Run the fuzzers (fuzz_parse_glob, true)	2m 39s
Run the fuzzers (fuzz_parse_size, true)	1m 47s
Run the fuzzers (fuzz_parse_time, true)	2m 43s
Run the fuzzers (fuzz_seq_parse_number, true)	2m 49s
	42m 45s

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