Fix depthtospace_ref.c

[FeiGeChuanShu]

[codecov]

Codecov Report

Merging #1055 (922105f) into tengine-lite (2a06d8c) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

❗ Current head 922105f differs from pull request most recent head 7094940. Consider uploading reports for the commit 7094940 to get more accurate results

@@               Coverage Diff                @@
##           tengine-lite    #1055      +/-   ##
================================================
- Coverage         47.33%   47.30%   -0.04%     
================================================
  Files               409      409              
  Lines             29898    29917      +19     
================================================
  Hits              14151    14151              
- Misses            15747    15766      +19     

Impacted Files	Coverage Δ
...urce/device/cpu/op/depthtospace/depthtospace_ref.c	8.33% <0.00%> (-5.46%)	⬇️

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[BUG1989]

lgtm!