Use NonZero* where applicable

src/symbols/tls/key.rs

@@ -1,14 +1,16 @@
 use crate::command_runner::CommandRunner;
 use crate::symbols::Symbol;
 use async_trait::async_trait;
+use nonzero_ext::nonzero;
 use std::error::Error;
+use std::num::NonZeroU32;
 use std::path::Path;
 
 #[derive(Debug)]
 pub struct Key<C, P> {
   file_path: P,
   command_runner: C,
-  bits: u32,
+  bits: NonZeroU32,
 }
 
 impl<C, P> Key<C, P> {
@@ -16,7 +18,7 @@ impl<C, P> Key<C, P> {
     Self {
       file_path,
       command_runner,
-      bits: 4096,
+      bits: nonzero!(4096u32), // FIXME: Policy
     }
   }
 }