selftests/mm temporary fix of hmm infinate loop

[PlaidCat]

jira SECO-170

In Rocky9 if you run ./run_vmtests.sh -t hmm it will fail and cause an infinate loop on ASSERTs in FIXTURE_TEARDOWN()
This temporary fix is based on the discussion here https://patchwork.kernel.org/project/linux-kselftest/patch/[email protected]/#25046055

We will investigate further kselftest updates that will resolve the root causes of this.

Testing

[maple@r9-sigcloud-builder mm]$ sudo ./run_vmtests.sh -t hmm 2>&1 /mnt/code/hmm_default_test5.txt
running: bash
--------------------------------
running bash ./test_hmm.sh smoke
--------------------------------
Running smoke test. Note, this test provides basic coverage.
TAP version 13
1..56
# Starting 56 tests from 5 test cases.
#  RUN           hmm.hmm_device_private.open_close ...
#            OK  hmm.hmm_device_private.open_close

ok 20 hmm.hmm_device_private.compound
#  RUN           hmm.hmm_device_private.exclusive ...
# hmm-tests.c:1750:exclusive:Expected ret (-16) == 0 (0)
close retunred (-1) fd is (3)
# exclusive: Test failed at step #1
#          FAIL  hmm.hmm_device_private.exclusive
not ok 21 hmm.hmm_device_private.exclusive
#  RUN           hmm.hmm_device_private.exclusive_mprotect ...
# hmm-tests.c:1804:exclusive_mprotect:Expected ret (-16) == 0 (0)
close retunred (-1) fd is (3)
# exclusive_mprotect: Test failed at step #1
#          FAIL  hmm.hmm_device_private.exclusive_mprotect
not ok 22 hmm.hmm_device_private.exclusive_mprotect
#  RUN           hmm.hmm_device_private.exclusive_cow ...
# hmm-tests.c:1857:exclusive_cow:Expected ret (-16) == 0 (0)
close retunred (-1) fd is (3)
# exclusive_cow: Test failed at step #1
#          FAIL  hmm.hmm_device_private.exclusive_cow
not ok 23 hmm.hmm_device_private.exclusive_cow

ok 56 hmm2.hmm2_device_coherent.double_map
# FAILED: 53 / 56 tests passed.
# Totals: pass:51 fail:3 xfail:0 xpass:0 skip:2 error:0
[PASS]
0

Previously this would infinite loop

# hmm-tests.c:1750:exclusive:Expected ret (-16) == 0 (0)
close retunred (-1) fd is (3)

[gvrose8192]

Thanks!!

[PlaidCat]

Actually need to fix the commit message