Corpus for mknod$loop:

Coverage	Program
2373	perf_event_open-mknod$loop-unlink
1982	seccomp$SECCOMP_SET_MODE_FILTER_LISTENER-mknod$loop
1964	mknod$loop-quotactl
1912	perf_event_open-mknod$loop-openat$dir
1828	perf_event_open-mknod$loop
1793	prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-mknod$loop
906	syz_mount_image$iso9660-mount-mknod$loop