better error code for File.getEndPos failure
better error code for File.getEndPos failure

zig-lang/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig,Dimenus/zig,raulgrell/zig,Dimenus/zig,andrewrk/zig,zig-lang/zig,zig-lang/zig,andrewrk/zig,Dimenus/zig