Remove GCC warning (switch case)
Remove GCC warning (switch case)

RedPitaya/scpi-parser,j123b567/scpi-parser,koeart/scpi-parser,RedPitaya/scpi-parser,WCP52/gpha,j123b567/scpi-parser,WCP52/gpha,WCP52/gpha,qingfengxia/scpi-parser,koeart/scpi-parser,WCP52/gpha,qingfengxia/scpi-parser