Corpus for ioctl$FIONREAD:

Coverage	Program
1660	perf_event_open-openat$ptmx-ioctl$FIONREAD
502	syz_open_dev$tty1-ioctl$FIONREAD
468	syz_open_dev$tty20-ioctl$FIONREAD
204	openat$hpet-ioctl$FIONREAD
118	pipe-write$P9_RFLUSH-ioctl$FIONREAD
115	openat$hpet-ioctl$FIONREAD
115	openat$hpet-ioctl$FIONREAD
112	openat$hpet-ioctl$FIONREAD
109	openat$nvram-ioctl$FIONREAD
107	syz_open_dev$tty1-ioctl$TIOCL_PASTESEL-ioctl$FIONREAD