lib/calib_yacc.y: eliminate priv() casting function
lib/calib_yacc.y: eliminate priv() casting function

Parse parameters are now passed as the correct type instead of `void *`,
so the static inline priv() function is no longer needed to cast the
pointer to the correct type.

olsonse/comedilib,olsonse/comedilib,Linux-Comedi/comedilib,olsonse/comedilib,olsonse/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,olsonse/comedilib,olsonse/comedilib