radix_tree: fix pmemcheck annotation

[igchor]

Use annotation only if PMEMCHECK is enabled (not just any valgrind tool).

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This change is 

[lukaszstolarczuk]

Reviewed 1 of 1 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @igchor)

a discussion (no related file):
just to double-check - it only applies in this one place...? 😉

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[kilobyte]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @lukaszstolarczuk)

a discussion (no related file):

Previously, lukaszstolarczuk (Łukasz Stolarczuk) wrote…

just to double-check - it only applies in this one place...? 😉

Yeah — at least everything builds for me with stock valgrind (Debian unstable + clang12 from experimental).

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[codecov]

Codecov Report

Merging #1123 (783d6ee) into master (f5552be) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1123      +/-   ##
==========================================
+ Coverage   94.20%   94.26%   +0.05%     
==========================================
  Files          52       52              
  Lines        5301     5298       -3     
==========================================
  Hits         4994     4994              
+ Misses        307      304       -3     

Flag	Coverage Δ
tests_clang_debug_cpp17	93.87% <100.00%> (+0.11%)	⬆️
tests_gcc_debug	90.97% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
include/libpmemobj++/experimental/radix_tree.hpp	98.43% <ø> (ø)
...nclude/libpmemobj++/experimental/inline_string.hpp	98.57% <100.00%> (-0.06%)	⬇️
...ude/libpmemobj++/container/concurrent_hash_map.hpp	94.35% <0.00%> (+0.15%)	⬆️
include/libpmemobj++/mutex.hpp	86.20% <0.00%> (+6.89%)	⬆️

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