ioctl_loop06: update loopback block size validation #506

Job	Run time
job (debian:stable, gcc, out, minimal)	8m 5s
job (debian:stable, arm64, aarch64-linux-gnu-gcc, 1, out, cross-compile)	4m 1s
job (alpine:latest, gcc)	8m 58s
job (debian:stable, ppc64el, powerpc64le-linux-gnu-gcc, 1, out, cross-compile)	3m 35s
job (debian:stable, gcc, i386)	9m 50s
job (debian:stable, s390x, s390x-linux-gnu-gcc, 1, out, cross-compile)	3m 38s
job (quay.io/centos/centos:stream9, gcc, out)	7m 16s
job (debian:testing, gcc)	10m 35s
job (debian:oldstable, gcc)	8m 59s
job (debian:oldstable, clang)	8m 53s
job (fedora:latest, clang, 1)	9m 44s
job (opensuse/archive:42.2, gcc)	11m 6s
job (debian:testing, clang)	7m 23s
job (ubuntu:bionic, gcc)	9m 4s
job (ubuntu:jammy, gcc, out)	4m 11s
job (opensuse/leap:latest, gcc)	8m 47s
	2h 4m 5s

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