Fix for #4866 - inconsistent arguments

[clydebarrow]

What does this implement/fix?

#4866 introduced some new functions, unfortunately the declaration and definition of one were inconsistent:

helpers.h:

std::string base64_encode(const uint8_t *buf, size_t buf_len);

vs helpers.cpp:

std::string base64_encode(const char *buf, unsigned int buf_len) {

This PR makes those consistent, and also fixes a couple of printf formats for size_t.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

Related issue or feature (if applicable): fixes

Pull request in esphome-docs with documentation (if applicable): esphome/esphome-docs#

Test Environment

• ESP32
• ESP32 IDF
• ESP8266
• RP2040
• BK72xx
• RTL87xx
• host

Example entry for config.yaml:

# Example config.yaml

Checklist:

• The code change is tested and works locally.
• Tests have been added to verify that the new code works (under tests/ folder).

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in esphome-docs.

[probot-esphome]

Hey there @esphome/core, mind taking a look at this pull request as it has been labeled with an integration (binary_sensor) you are listed as a code owner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.46%. Comparing base (4d8b5ed) to head (3a6d368).
Report is 480 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6639      +/-   ##
==========================================
- Coverage   53.70%   53.46%   -0.25%     
==========================================
  Files          50       50              
  Lines        9408     9545     +137     
  Branches     1654     1685      +31     
==========================================
+ Hits         5053     5103      +50     
- Misses       4056     4132      +76     
- Partials      299      310      +11     

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[jesserockz]

Woops, thanks for fixing