Use defer to unlock mutex

[jimthematrix]

No description provided.

[codecov-commenter]

Codecov Report

Merging #89 (22d8b9f) into main (b8908f5) will increase coverage by 2.36%.
The diff coverage is 98.00%.

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
+ Coverage   65.93%   68.30%   +2.36%     
==========================================
  Files          47       47              
  Lines        4439     4483      +44     
==========================================
+ Hits         2927     3062     +135     
+ Misses       1330     1229     -101     
- Partials      182      192      +10     

Impacted Files	Coverage Δ
internal/fabric/client/api.go	0.00% <ø> (ø)
internal/fabric/client/identity.go	70.83% <90.90%> (+41.82%)	⬆️
internal/fabric/client/client_ccp.go	41.22% <100.00%> (+4.43%)	⬆️
...nternal/fabric/client/client_gateway_clientside.go	40.76% <100.00%> (+5.47%)	⬆️
internal/fabric/client/eventsubscriber.go	49.23% <100.00%> (+7.12%)	⬆️
internal/fabric/client/ledger.go	32.89% <100.00%> (+7.89%)	⬆️
internal/events/eventstream.go	91.96% <0.00%> (-0.90%)	⬇️

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[peterbroadhurst]

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