Remove some default branches in exhaustive switch statements

[codecov-commenter]

Codecov Report

Merging #244 (6a7300f) into master (72ac972) will increase coverage by 0.31%. The diff coverage is 100.00%.

:exclamation: Current head 6a7300f differs from pull request most recent head debbcfd. Consider uploading reports for the commit debbcfd to get more accurate results

@@            Coverage Diff             @@
##           master     #244      +/-   ##
==========================================
+ Coverage   96.49%   96.80%   +0.31%     
==========================================
  Files          20       20              
  Lines        1541     1535       -6     
==========================================
- Hits         1487     1486       -1     
+ Misses         54       49       -5     

Impacted Files	Coverage Δ
src/cbor.c	99.44% <ø> (+1.63%)	:arrow_up:
src/cbor/floats_ctrls.c	97.75% <ø> (+1.08%)	:arrow_up:
src/cbor/ints.c	100.00% <ø> (+0.99%)	:arrow_up:
src/cbor/streaming.c	99.00% <100.00%> (-0.01%)	:arrow_down:

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