input check in file download statistic
input check in file download statistic

it's not in issue in the core but if someone uses the method
getDownloadStatistics and allows the user to specify the limit,
we're opening a security hole.

Former-commit-id: f3b653741d928edd3f1732e86b6e340549711fdf
a3020/concrete5,haeflimi/concrete5,mlocati/concrete5,haeflimi/concrete5,mlocati/concrete5,triplei/concrete5-8,MrKarlDilkington/concrete5,rikzuiderlicht/concrete5,mainio/concrete5,concrete5/concrete5,biplobice/concrete5,rikzuiderlicht/concrete5,jaromirdalecky/concrete5,mlocati/concrete5,mainio/concrete5,rikzuiderlicht/concrete5,KorvinSzanto/concrete5,olsgreen/concrete5,deek87/concrete5,triplei/concrete5-8,hissy/concrete5,hissy/concrete5,biplobice/concrete5,hissy/concrete5,deek87/concrete5,biplobice/concrete5,acliss19xx/concrete5,haeflimi/concrete5,deek87/concrete5,biplobice/concrete5,MrKarlDilkington/concrete5,KorvinSzanto/concrete5,mainio/concrete5,haeflimi/concrete5,a3020/concrete5,MrKarlDilkington/concrete5,jaromirdalecky/concrete5,deek87/concrete5,jaromirdalecky/concrete5,jaromirdalecky/concrete5,acliss19xx/concrete5,olsgreen/concrete5,acliss19xx/concrete5,concrete5/concrete5,mlocati/concrete5,concrete5/concrete5,KorvinSzanto/concrete5,concrete5/concrete5,olsgreen/concrete5,hissy/concrete5,triplei/concrete5-8