option owns vulkan device index

[nihui]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.35294% with 6 lines in your changes missing coverage. Please review.

Project coverage is 95.43%. Comparing base (f7e6411) to head (a1a43fa).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/gpu.cpp	69.23%	4 Missing ⚠️
src/net.cpp	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5973      +/-   ##
==========================================
+ Coverage   95.33%   95.43%   +0.09%     
==========================================
  Files         819      819              
  Lines      268460   268681     +221     
==========================================
+ Hits       255944   256407     +463     
+ Misses      12516    12274     -242     

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