From c7f4dba53a2288e2bcea819d8a060ee4568896fb Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Tue, 9 May 2017 19:06:42 +0800
Subject: [PATCH] remove unnecessary mut

---
 firmware/src/pid.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/firmware/src/pid.rs b/firmware/src/pid.rs
index 3b0921b..af46758 100644
--- a/firmware/src/pid.rs
+++ b/firmware/src/pid.rs
@@ -63,7 +63,7 @@ impl Controller {
     }
 
     #[allow(dead_code)]
-    pub fn is_within(&mut self, tolerance: f32) -> bool {
+    pub fn is_within(&self, tolerance: f32) -> bool {
         match self.last_input {
             None => false,
             Some(last_input) => (last_input - self.target).abs() < tolerance