chore: remove redundant return statements from protocol.ts

[trivikr]

Issue #, if available:
N/A

Description of changes:
remove redundant return statements from protocol.ts

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 1e6a48f
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[codecov-io]

Codecov Report

Merging #1145 into master will increase coverage by 0.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1145      +/-   ##
==========================================
+ Coverage   73.54%   73.88%   +0.33%     
==========================================
  Files         283      284       +1     
  Lines       13014    13187     +173     
  Branches     3030     3106      +76     
==========================================
+ Hits         9571     9743     +172     
- Misses       3443     3444       +1     

Impacted Files	Coverage Δ
packages/util-body-length-browser/src/index.ts	71.42% <0.00%> (ø)
protocol_tests/aws-json/protocols/Aws_json1_1.ts	69.46% <0.00%> (+0.12%)	⬆️
protocol_tests/aws-query/protocols/Aws_query.ts	69.58% <0.00%> (+0.46%)	⬆️
protocol_tests/aws-ec2/protocols/Aws_ec2.ts	65.00% <0.00%> (+0.47%)	⬆️
protocol_tests/aws-ec2/models/index.ts	70.12% <0.00%> (+0.50%)	⬆️
protocol_tests/aws-restjson/models/index.ts	69.81% <0.00%> (+0.72%)	⬆️
...rotocol_tests/aws-restxml/protocols/Aws_restXml.ts	68.77% <0.00%> (+0.93%)	⬆️
...ol_tests/aws-restjson/protocols/Aws_restJson1_1.ts	65.90% <0.00%> (+1.15%)	⬆️
protocol_tests/aws-query/models/index.ts	70.32% <0.00%> (+1.18%)	⬆️
protocol_tests/aws-restxml/models/index.ts	68.53% <0.00%> (+1.18%)	⬆️

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 5b82eb7
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[trivikr]

This PR was merged as a follow-up to smithy-lang/smithy-typescript#176, instead of merging #1149

But the two PRs are similar, so won't be reverting

[lock]

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