fix new memcheck breakage in libkmod

[kilobyte]

The following tests fail on Debian unstable/bullseye:

obj_basic_integration/TEST5
obj_basic_integration/TEST6
obj_action/TEST1
obj_mem/TEST1
obj_memcheck_register/TEST0
pmempool_create/TEST7

because:

==60721== Conditional jump or move depends on uninitialised value(s)
==60721==    at 0x4DF7A72: ??? (in /usr/lib/x86_64-linux-gnu/libkmod.so.2.3.6)
==60721==    by 0x4DF2DBE: ??? (in /usr/lib/x86_64-linux-gnu/libkmod.so.2.3.6)
==60721==    by 0x4DF34DC: ??? (in /usr/lib/x86_64-linux-gnu/libkmod.so.2.3.6)
==60721==    by 0x4DF9AA6: kmod_module_new_from_lookup (in /usr/lib/x86_64-linux-gnu/libkm
2.3.6)
==60721==    by 0x4B898EA: ??? (in /usr/lib/x86_64-linux-gnu/libndctl.so.6.19.1)
==60721==    by 0x4B8F15E: ??? (in /usr/lib/x86_64-linux-gnu/libndctl.so.6.19.1)
==60721==    by 0x4B8340D: ??? (in /usr/lib/x86_64-linux-gnu/libndctl.so.6.19.1)
==60721==    by 0x4B8B67C: ndctl_region_get_first (in /usr/lib/x86_64-linux-gnu/libndctl.s
.1)
==60721==    by 0x497B534: pmem2_region_namespace (region_namespace_ndctl.c:154)
==60721==    by 0x4978ADC: pmem2_source_device_usc (usc_ndctl.c:46)
==60721==    by 0x4975116: shutdown_state_add_part (shutdown_state.c:72)
==60721==    by 0x496E911: util_header_create (set.c:2315)
==60721==

---

This change is 

[codecov]

Codecov Report

Merging #5153 (02762f3) into master (aebecc7) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5153      +/-   ##
==========================================
- Coverage   69.11%   69.10%   -0.02%     
==========================================
  Files         187      187              
  Lines       28560    28560              
==========================================
- Hits        19739    19736       -3     
- Misses       8821     8824       +3