sealer: fix error message

[arajasek]

No description provided.

[codecov]

Codecov Report

Merging #8121 (36aa243) into master (f17bbc9) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #8121   +/-   ##
=======================================
  Coverage   39.37%   39.38%           
=======================================
  Files         666      666           
  Lines       72460    72462    +2     
=======================================
+ Hits        28534    28540    +6     
- Misses      38999    39000    +1     
+ Partials     4927     4922    -5     

Impacted Files	Coverage Δ
extern/storage-sealing/checks.go	30.76% <0.00%> (-0.61%)	⬇️
markets/loggers/loggers.go	88.88% <0.00%> (-11.12%)	⬇️
chain/rand/rand.go	61.90% <0.00%> (-5.72%)	⬇️
chain/types/blockheader.go	55.55% <0.00%> (-2.23%)	⬇️
blockstore/autobatch.go	56.30% <0.00%> (-1.69%)	⬇️
extern/sector-storage/sched.go	84.77% <0.00%> (-0.83%)	⬇️
chain/store/store.go	63.00% <0.00%> (-0.67%)	⬇️
chain/gen/gen.go	68.80% <0.00%> (-0.62%)	⬇️
storage/wdpost_run.go	69.79% <0.00%> (-0.41%)	⬇️
chain/messagepool/selection.go	83.91% <0.00%> (-0.39%)	⬇️
... and 12 more

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