Bring UsefulBuf test coverage to 100% (#238) #203

Job	Run time
• gcc • ubuntu:22.04	39s
-DQCBOR_DISABLE_NON_INTEGER_LABELS • gcc • ubuntu:22.04	1m 6s
-DQCBOR_DISABLE_TAGS • gcc • ubuntu:22.04	27s
-DUSEFULBUF_DISABLE_ALL_FLOAT • gcc • ubuntu:22.04	1m 2s
-DQCBOR_DISABLE_FLOAT_HW_USE • gcc • ubuntu:22.04	19s
-DQCBOR_DISABLE_PREFERRED_FLOAT • gcc • ubuntu:22.04	1m 15s
-DQCBOR_CONFIG_DISABLE_EXP_AND_MANTISSA • gcc • ubuntu:22.04	23s
-DQCBOR_DISABLE_ENCODE_USAGE_GUARDS • gcc • ubuntu:22.04	59s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_STRINGS • gcc • ubuntu:22.04	21s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_ARRAYS • gcc • ubuntu:22.04	18s
-DQCBOR_DISABLE_UNCOMMON_TAGS • gcc • ubuntu:22.04	30s
• clang • ubuntu:22.04	35s
-DQCBOR_DISABLE_NON_INTEGER_LABELS • clang • ubuntu:22.04	54s
-DQCBOR_DISABLE_TAGS • clang • ubuntu:22.04	2m 9s
-DUSEFULBUF_DISABLE_ALL_FLOAT • clang • ubuntu:22.04	1m 51s
-DQCBOR_DISABLE_FLOAT_HW_USE • clang • ubuntu:22.04	45s
-DQCBOR_DISABLE_PREFERRED_FLOAT • clang • ubuntu:22.04	58s
-DQCBOR_CONFIG_DISABLE_EXP_AND_MANTISSA • clang • ubuntu:22.04	54s
-DQCBOR_DISABLE_ENCODE_USAGE_GUARDS • clang • ubuntu:22.04	31s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_STRINGS • clang • ubuntu:22.04	56s
-DQCBOR_DISABLE_INDEFINITE_LENGTH_ARRAYS • clang • ubuntu:22.04	1m 44s
-DQCBOR_DISABLE_UNCOMMON_TAGS • clang • ubuntu:22.04	1m 3s
	19m 39s

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