Clean up encoder.go

[shuheiktgw]

While working on another issue, I noticed a few minor problems in encoder.go. I could include the fixes in the same PR, but I thought it would be better to create a separate PR for easier review.

• defer statements can be placed inside the if statement
• Some variables are shadowing external functions or variables

---

• Describe the purpose for which you created this PR.
• Create test code that corresponds to the modification

[Copilot]

Pull Request Overview

This PR addresses minor cleanup improvements in encoder.go and struct.go, focusing on reducing variable shadowing and simplifying defer statements.

• Renames local variables (e.g., "structField" to "sf" and "structFieldMap" to "fieldMap") to avoid shadowing external declarations.
• Refactors defer statement placement in encode.go for improved clarity in indentation management.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
struct.go	Renamed variables to prevent shadowing and clarify struct field usage.
encode.go	Adjusted defer logic for indentation and renamed local variables for clarity.

Comments suppressed due to low confidence (2)

struct.go:47

• [nitpick] The abbreviation 'sf' may be unclear to some readers; consider using a more descriptive name (e.g., 'structField') while ensuring external shadowing is still avoided.

sf := &StructField{

encode.go:819

• [nitpick] Using 'sf' here might reduce clarity in the encoding logic; a more descriptive name (such as 'fieldData' or 'structField') could improve readability.

sf := fieldMap[field.Name]

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 77.86%. Comparing base (d1e3460) to head (6c4b4af).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #703      +/-   ##
==========================================
- Coverage   77.89%   77.86%   -0.03%     
==========================================
  Files          22       22              
  Lines        7965     7957       -8     
==========================================
- Hits         6204     6196       -8     
  Misses       1348     1348              
  Partials      413      413              

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