Use logrus instead of printf for warning

[estesp]

Minor nit follow-on to #3848

Signed-off-by: Phil Estes estesp@linux.vnet.ibm.com

[theopenlab-ci]

Build succeeded.

• containerd-build-arm64 : SUCCESS in 4m 30s (non-voting)

[codecov-io]

Codecov Report

Merging #3890 into master will decrease coverage by 3.4%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3890      +/-   ##
==========================================
- Coverage   45.72%   42.31%   -3.41%     
==========================================
  Files         117      130      +13     
  Lines       11765    14689    +2924     
==========================================
+ Hits         5379     6216     +837     
- Misses       5462     7548    +2086     
- Partials      924      925       +1

Flag	Coverage Δ
#linux	45.72% <ø> (ø)	⬆️
#windows	37.82% <ø> (?)

Impacted Files	Coverage Δ
archive/tar_opts.go	58.82% <0%> (-12.61%)	⬇️
snapshots/native/native.go	42.42% <0%> (-10.27%)	⬇️
cio/io.go	46.47% <0%> (-8.53%)	⬇️
archive/tar.go	48.18% <0%> (-8.51%)	⬇️
metadata/snapshot.go	48.47% <0%> (-7.19%)	⬇️
metadata/containers.go	49.84% <0%> (-6.26%)	⬇️
content/local/writer.go	58.65% <0%> (-5.55%)	⬇️
content/local/store.go	49.52% <0%> (-5.29%)	⬇️
metadata/images.go	57.41% <0%> (-4.97%)	⬇️
archive/compression/compression.go	58.69% <0%> (-4.7%)	⬇️
... and 74 more

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[fuweid]

LGTM

[crosbymichael]

LGTM