RDKB-65777: 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 static analysis (Coverity) findings by tightening cleanup paths and preventing resource leaks across the RBUS bridge and HE bus implementation.

Changes:

• Add missing RBUS object/value releases on error paths in bus.c.
• Ensure HE bus subscription/event handling frees allocated structures and uses a unified cleanup path.
• Avoid invalid close() calls by guarding against invalid file descriptors, and fix JSON buffer lifetime handling.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
source/platform/rdkb/bus.c	Releases RBUS values/objects on early-return error paths to prevent leaks.
source/platform/linux/he_bus/src/he_bus_data_conversion.c	Frees newly allocated subscription entry on invalid payload type before returning.
source/platform/linux/he_bus/src/he_bus_core.c	Prevents duplicate table row-template creation; adds structured cleanup for subscription request building/sending.
source/platform/linux/he_bus/src/he_bus_connection.c	Guards close() calls with invalid-FD checks during reconnect/shutdown paths.
source/platform/common/data_model/wifi_dml_api.c	Fixes JSON file read/parse buffer lifetime by freeing data on additional error/success paths.

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