[Coverity CID: 235945] Incorrect sizeof expression in include/sys/cbprintf_cxx.h

[zephyrbot]

Static code scan issues found in file:

https://github.com/zephyrproject-rtos/zephyr/tree/0622bde3bf22926544c1aaef4c01dfa23d79f26e/include/sys/cbprintf_cxx.h

Category: Incorrect expression
Function: z_cbprintf_cxx_arg_size
Component: Other
CID: 235945

Details:

https://github.com/zephyrproject-rtos/zephyr/blob/0622bde3bf22926544c1aaef4c01dfa23d79f26e/include/sys/cbprintf_cxx.h

Please fix or provide comments in coverity using the link:

https://scan9.coverity.com/reports.htm#v29271/p12996.

Note: This issue was created automatically. Priority was set based on classification
of the file affected and the impact field in coverity. Assignees were set using the CODEOWNERS file.

[nordic-krch]

Triaged. Intentianal use of sizeof(arg + 0) to promote arg.