Fix small leak in explode

[revans2]

This fixes #10244 you can look at that for the analysis of the bug.

[davidwendt]

LGTM. Good catch.

[codecov]

Codecov Report

Merging #10245 (adbea69) into branch-22.04 (a7d88cd) will increase coverage by 0.03%.
The diff coverage is 0.00%.

❗ Current head adbea69 differs from pull request most recent head 53882f0. Consider uploading reports for the commit 53882f0 to get more accurate results

@@               Coverage Diff                @@
##           branch-22.04   #10245      +/-   ##
================================================
+ Coverage         10.42%   10.45%   +0.03%     
================================================
  Files               119      122       +3     
  Lines             20603    20527      -76     
================================================
- Hits               2148     2147       -1     
+ Misses            18455    18380      -75     

Impacted Files	Coverage Δ
python/cudf/cudf/_fuzz_testing/fuzzer.py	0.00% <0.00%> (ø)
python/cudf/cudf/_fuzz_testing/io.py	0.00% <0.00%> (ø)
python/cudf/cudf/_fuzz_testing/main.py	0.00% <0.00%> (ø)
python/cudf/cudf/_version.py	0.00% <0.00%> (ø)
python/cudf/cudf/comm/gpuarrow.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/_base_index.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/categorical.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/column.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/datetime.py	0.00% <ø> (ø)
python/cudf/cudf/core/column/methods.py	0.00% <0.00%> (ø)
... and 48 more

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[revans2]

@gpucibot merge