AP_Proximity: prevent buffer overflow in LD06 driver #44893

Job	Run time
build (stm32f7, chibios, 10)	13m 25s
build (stm32h7, chibios, 10)	12m 27s
build (fmuv2-plane, chibios, 10)	5m 54s
build (periph-build, chibios, 10)	13m 25s
build (iofirmware, chibios, 10)	2m 58s
build (CubeOrange-bootloader, chibios, 10)	1m 26s
build (fmuv3-bootloader, chibios, 10)	1m 22s
build (revo-bootloader, chibios, 10)	1m 6s
build (stm32h7-debug, chibios, 10)	7m 23s
build (fmuv3, chibios, 10)	14m 7s
build (revo-mini, chibios, 10)	10m 35s
build (MatekF405-Wing, chibios, 10)	11m 19s
build (CubeOrange-ODID, chibios, 10)	8m 8s
build (CubeRedPrimary-bootloader, chibios, 10)	1m 24s
build (configure-all, chibios, 10)	11m 45s
build (build-options-defaults-test, chibios, 10)	23m 16s
build (signing, chibios, 10)	9m 32s
build (CubeOrange-PPP, chibios, 10)	6m 50s
build (CubeRed-EKF2, chibios, 10)	6m 39s
build (SOHW, chibios, 10)	11m 6s
build (Pixhawk6X-PPPGW, chibios, 10)	3m 12s
build (new-check, chibios, 10)	13m 15s
	3h 10m 34s

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