fix(usb_serial_jtag_driver): tx_ring_buf not checked for successful allocation (IDFGH-16876)

[addowhite]

The NULL check for rx_ring_buf looks to have been copied+pasted for tx_ring_buf but the name was not updated in both places.

This means if the tx_ring_buf allocation fails, an error is not returned.

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Note

Corrects the NULL check to validate tx_ring_buf allocation (instead of rx_ring_buf) and properly error on failure in usb_serial_jtag_driver_install.

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[github-actions]

Warnings

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Some issues found for the commit messages in this PR: the commit message "tx_ring_buf not checked for successful allocation": 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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