codes.Unknown -> codes.NotFound

[glimchb]

Signed-off-by: Boris Glimcher Boris.Glimcher@emc.com

[codecov]

Codecov Report

Merging #304 (d92ccb2) into main (81f602f) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #304      +/-   ##
==========================================
+ Coverage   71.63%   71.73%   +0.09%     
==========================================
  Files          14       14              
  Lines        1745     1751       +6     
==========================================
+ Hits         1250     1256       +6     
  Misses        449      449              
  Partials       46       46              

Impacted Files	Coverage Δ
pkg/backend/aio.go	92.85% <100.00%> (ø)
pkg/backend/null.go	92.85% <100.00%> (ø)
pkg/backend/nvme.go	88.13% <100.00%> (ø)
pkg/frontend/blk.go	88.39% <100.00%> (+0.21%)	⬆️
pkg/frontend/nvme.go	84.36% <100.00%> (+0.14%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[intelfisz]

Other that the proposal by Artsiom to have a common place with status definition, the change looks good.