Bring UsefulBuf test coverage to 100% #200

Job	Run time
• gcc • ubuntu:22.04	32s
-DQCBOR_DISABLE_NON_INTEGER_LABELS • gcc • ubuntu:22.04	1m 30s
-DQCBOR_DISABLE_TAGS • gcc • ubuntu:22.04	19s
-DUSEFULBUF_DISABLE_ALL_FLOAT • gcc • ubuntu:22.04	1m 0s
-DQCBOR_DISABLE_FLOAT_HW_USE • gcc • ubuntu:22.04	22s
-DQCBOR_DISABLE_PREFERRED_FLOAT • gcc • ubuntu:22.04	41s
-DQCBOR_CONFIG_DISABLE_EXP_AND_MANTISSA • gcc • ubuntu:22.04	28s
-DQCBOR_DISABLE_ENCODE_USAGE_GUARDS • gcc • ubuntu:22.04	1m 48s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_STRINGS • gcc • ubuntu:22.04	35s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_ARRAYS • gcc • ubuntu:22.04	45s
-DQCBOR_DISABLE_UNCOMMON_TAGS • gcc • ubuntu:22.04	36s
• clang • ubuntu:22.04	1m 1s
-DQCBOR_DISABLE_NON_INTEGER_LABELS • clang • ubuntu:22.04	42s
-DQCBOR_DISABLE_TAGS • clang • ubuntu:22.04	2m 18s
-DUSEFULBUF_DISABLE_ALL_FLOAT • clang • ubuntu:22.04	37s
-DQCBOR_DISABLE_FLOAT_HW_USE • clang • ubuntu:22.04	34s
-DQCBOR_DISABLE_PREFERRED_FLOAT • clang • ubuntu:22.04	43s
-DQCBOR_CONFIG_DISABLE_EXP_AND_MANTISSA • clang • ubuntu:22.04	57s
-DQCBOR_DISABLE_ENCODE_USAGE_GUARDS • clang • ubuntu:22.04	1m 15s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_STRINGS • clang • ubuntu:22.04	39s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_ARRAYS • clang • ubuntu:22.04	1m 34s
-DQCBOR_DISABLE_UNCOMMON_TAGS • clang • ubuntu:22.04	4m 17s
	23m 13s

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