IIOD: Fix lexer text input function
IIOD: Fix lexer text input function

The macro YY_INPUT(buf,result,max_size) expects 'result' to be of type
size_t, while we were setting it to a value of type int.

Signed-off-by: Paul Cercueil <73d292422978d45c9eeef455bb1b24a0db453722@analog.com>

analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio