drivers: sensor: Fix uninitialized variable #148865

Job	Run time
twister-build-prep / prep_pr	2m 49s
twister-build-prep / prep_push	0s
twister-build (1)	28m 22s
twister-build (2)	30m 29s
twister-build (3)	24m 29s
twister-build (4)	29m 21s
twister-build (5)	22m 26s
twister-build (6)	23m 22s
twister-build (7)	25m 42s
Publish Unit Tests Results	18s
Check Twister Status / all jobs passed	1s
	3h 7m 19s

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