sys/syz-sysgen: fix typo #18425

Job	Run time
build	4m 23s
aux	4m 29s
dashboard	1m 58s
race	7m 8s
race_dashboard	2m 43s
old	7m 6s
arch (presubmit_arch_freebsd)	6m 24s
arch (presubmit_arch_linux)	10m 55s
arch (presubmit_arch_netbsd)	3m 53s
arch (presubmit_arch_windows)	3m 43s
arch (presubmit_arch_executor)	3m 15s
arch (presubmit_arch_openbsd)	3m 49s
gvisor	4m 2s
arch (presubmit_arch_darwin)	3m 48s
	1h 7m 36s

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