Unused return value in subsys/ipc/ipc_service/lib/icmsg.c

[edersondisouza]

Describe the bug

Static code scan found issues in file https://github.com/zephyrproject-rtos/zephyr/blob/main/subsys/ipc/ipc_service/lib/icmsg.c#L438

Return value is never used - not sure if a failure here means that code should bail out, otherwise I'd send a fix.

Coverity link: https://scan9.scan.coverity.com/#/project-view/61615/12996?selectedIssue=516253
CID: 516253
Introduced in: 84a215a

Impact
Minor (and code scan complains)

[github-actions]

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