Sensor decoder context should not be reused in Sensor Read and Decode example

[ymleung314]

Describe the bug
When using the sample code in Sensor Polling Read docs, temp_decoder is reused for all sensor_decode. The frame iterator temp_decoder.fit is not reset after each read-decode cycle, later call to sensor_decode will just return 0.

See: https://docs.zephyrproject.org/latest/hardware/peripherals/sensor/read_and_decode.html

To Reproduce
Just set up the overlay and Kconfig for ICM42688 , copy and paste then run it.

Expected behavior
New values will read on every iteration.

Impact
May be confusing to sensor read-decode API first-time users.

Environment (please complete the following information):

• OS: Linux

Additional context
Tested with an ICM42688.

[github-actions]

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[danieldegrasse]

@ymleung314 is there a specific bug you have observed with the sample here? Or are these suggestions for code improvement?

If there is a bug here, please update this issue following the bug template given here: https://github.com/zephyrproject-rtos/zephyr/issues/new?template=001_bug_report.md

[ymleung314]

It believe it's a bug but because it's a code snippet in the docs, I am not sure if it is suitable to use the ordinary bug template here.

[danieldegrasse]

It believe it's a bug but because it's a code snippet in the docs, I am not sure if it is suitable to use the ordinary bug template here.

I'd still prefer you did- even if the change is just a doc fix, it is still an issue

[github-actions]

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