CarbonixCommon: bit_esc: suppress nil warnings #1154

Job	Run time
build (stm32f7, chibios, 10)	3m 59s
build (stm32h7, chibios, 10)	3m 16s
build (fmuv2-plane, chibios, 10)	2m 4s
build (periph-build, chibios, 10)	4m 36s
build (iofirmware, chibios, 10)	1m 22s
build (CubeOrange-bootloader, chibios, 10)	45s
build (fmuv3-bootloader, chibios, 10)	44s
build (revo-bootloader, chibios, 10)	46s
build (stm32h7-debug, chibios, 10)	2m 20s
build (fmuv3, chibios, 10)	5m 24s
build (revo-mini, chibios, 10)	4m 18s
build (MatekF405-Wing, chibios, 10)	4m 35s
build (CubeOrange-ODID, chibios, 10)	2m 24s
build (CubeRedPrimary-bootloader, chibios, 10)	47s
build (configure-all, chibios, 10)	9m 32s
build (build-options-defaults-test, chibios, 10)	6m 5s
build (signing, chibios, 10)	2m 41s
build (CubeOrange-PPP, chibios, 10)	1m 59s
build (CubeOrange-SOHW, chibios, 10)	1m 56s
build (Pixhawk6X-PPPGW, chibios, 10)	1m 9s
	1h 0m 42s

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