(fix/examples): Fix memory allocation checks for rssi and scanned_name (IDFGH-17024)

[cyberman54]

Description

Updated memory allocation checks to correctly verify pointer validity

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Note

Ensures proper pointer validation during BLE advertising report parsing to avoid potential crashes.

• In app_bt.c (hci_evt_process), replace mistaken data_len == NULL checks with correct checks for rssi and scanned_name after their respective malloc calls.

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Warnings

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Some issues found for the commit messages in this PR: the commit message "Fix memory allocation checks for rssi and scanned_name": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

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