Fix dead lock of vfnet

[hhaAndroid]

resolve: #5009

Precision alignment after modification.

[codecov]

Codecov Report

Merging #5058 (4b89db3) into master (8a432d2) will increase coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #5058      +/-   ##
==========================================
+ Coverage   66.71%   66.78%   +0.06%     
==========================================
  Files         259      259              
  Lines       20269    20267       -2     
  Branches     3447     3447              
==========================================
+ Hits        13523    13535      +12     
+ Misses       6019     6003      -16     
- Partials      727      729       +2     

Flag	Coverage Δ
unittests	66.74% <0.00%> (+0.05%)	⬆️

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Impacted Files	Coverage Δ
mmdet/models/dense_heads/vfnet_head.py	31.71% <0.00%> (+0.23%)	⬆️
mmdet/models/dense_heads/corner_head.py	75.60% <0.00%> (+1.87%)	⬆️
mmdet/models/roi_heads/test_mixins.py	57.86% <0.00%> (+1.88%)	⬆️
mmdet/models/detectors/cornernet.py	100.00% <0.00%> (+5.12%)	⬆️

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