libbpf-tools/memleak: Fixes off-by-one error for `-Z` and `-z` option… #3160

Job	Run time
test_bcc_fedora (fedora, 38, f38, Debug, critical.log)	12m 53s
test_bcc_fedora (fedora, 38, f38, Release, critical.log)	11m 59s
test_bcc (ubuntu, 20.04, focal, 12, Debug, critical.log, ON)	13m 20s
test_bcc (ubuntu, 20.04, focal, 12, Debug, critical.log, OFF)	13m 28s
test_bcc (ubuntu, 20.04, focal, 12, Release, critical.log, ON)	11m 56s
test_bcc (ubuntu, 20.04, focal, 15, Debug, critical.log, ON)	13m 46s
test_bcc (ubuntu, 20.04, focal, 15, Debug, critical.log, OFF)	13m 37s
test_bcc (ubuntu, 20.04, focal, 15, Release, critical.log, ON)	12m 27s
test_bcc (ubuntu, 20.04, focal, 17, Debug, critical.log, ON)	13m 44s
test_bcc (ubuntu, 20.04, focal, 17, Debug, critical.log, OFF)	13m 44s
test_bcc (ubuntu, 20.04, focal, 17, Release, critical.log, ON)	12m 40s
	2h 23m 34s

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