fix: fix incorrect conversion between integer types

[weichou1229]

fix incorrect conversion between integer types

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 32.76%. Comparing base (10f464a) to head (528a90e).

Files with missing lines	Patch %	Lines
internal/driver/pullpointmanager.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #473   +/-   ##
=======================================
  Coverage   32.76%   32.76%           
=======================================
  Files          21       21           
  Lines        1923     1923           
=======================================
  Hits          630      630           
  Misses       1217     1217           
  Partials       76       76           

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[cloudxxx8]

LGTM