fix os.getrandom logic to fill the entire buffer
fix os.getrandom logic to fill the entire buffer

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