powerpc/dexcr:hashchk_test from ubuntu_kernel_selftests failed on Mantic P10 VM

[Po-Hsu Lin]

Issue found on Power10 VM with Mantic since 6.5.0-12.12

Test log:
 Running 'make run_tests -C powerpc/dexcr TEST_PROGS=hashchk_test TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
 make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/dexcr'
 TAP version 13
 1..1
 # timeout set to 45
 # selftests: powerpc/dexcr: hashchk_test
 # test: hashchk_detected
 # tags: git_version:unknown
 # success: hashchk_detected
 # test: hashchk_exec_random_key
 # tags: git_version:unknown
 # [FAIL] Test FAILED on line 142: bad address check
 # failure: hashchk_exec_random_key
 # test: hashchk_fork_share_key
 # tags: git_version:unknown
 # success: hashchk_fork_share_key
 # test: hashchk_clone_share_key
 # tags: git_version:unknown
 # success: hashchk_clone_share_key
 not ok 1 selftests: powerpc/dexcr: hashchk_test # exit=1