Minor tidy to fread.c PR
Minor tidy to fread.c PR

typedef updated from _Bool to int too.  Reduced trash variable variants.
jangorecki/data.table,vlulla/data.table,vlulla/data.table,Rdatatable/data.table,Rdatatable/data.table,Rdatatable/data.table,jangorecki/data.table,jangorecki/data.table,jangorecki/data.table,vlulla/data.table,Rdatatable/data.table,vlulla/data.table