RDKB-65853: Fixing coverity issue

[navyasher]

Reason for change: Fixing coverity issues.
Test Procedure: Build should be successful and the regression test should also succeed
Risks: Low
Priority: P1
Signed-off-by: Navya_Sheregar@comcast.com

[Copilot]

Pull request overview

This PR addresses Coverity-reported resource leaks by ensuring webconfig_subdoc_data_t encoded buffers are freed on all exit paths, and removes an unused union member from a monitoring payload struct.

Changes:

• Added webconfig_data_free() calls before freeing webconfig_subdoc_data_t in multiple error and success paths to prevent leaks of u.encoded.raw.
• Fixed a leak in EasyMesh disassociation handling by freeing the removed hash-map value (stats).
• Removed an unused associated_devs_t devs union member from wifi_monitor_data_t.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
source/apps/linkquality/wifi_linkquality.c	Ensures webconfig_subdoc_data_t encoded raw buffer is freed on encode/publish failures and after success.
source/apps/em/wifi_em.c	Adds missing webconfig_data_free() cleanup in several publish paths and frees removed client stats on disassoc.
include/wifi_base.h	Removes unused devs union member from wifi_monitor_data_t.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.