Fix clippy lints

Author: oll3

examples/blinky.rs

@@ -58,9 +58,9 @@ fn get_args() -> Option<Arguments> {
         Err(_) => return None,
     };
     Some(Arguments {
-        pin: pin,
-        duration_ms: duration_ms,
-        period_ms: period_ms,
+        pin,
+        duration_ms,
+        period_ms,
     })
 }
 

src/error.rs

@@ -1,5 +1,3 @@
-#[cfg(not(target_os = "wasi"))]
-use nix;
 use std::convert;
 use std::fmt;
 use std::io;