cleanup warnings/weird code

src/ega.rs

@@ -221,11 +221,11 @@ impl U4Lzw {
   }
 
   fn hash_primary(root: u8, code: u16) -> usize {
-    ((root as (u16) << 4) ^ code) as usize
+    (((root as u16) << 4) ^ code) as usize
   }
 
   fn hash_secondary(root: u8, code: u16) -> usize {
-    let base = (((root as (u16) << 1) + code) | 0x800) as u32;
+    let base = ((((root as u16) << 1) + code) | 0x800) as u32;
     let squared = base * base;
     ((squared & 0x0003ffc0) >> 6) as usize
   }

src/view.rs

@@ -85,7 +85,7 @@ impl ViewRoot<gfx_device_gl::Device, ColorFormat, DepthFormat> {
         let depth = &buffers.as_ref().expect("vr depth buffer").depth;
 
         let proj_mat = vr.projection_matrix(eye, NEAR, FAR);
-        let mut eye_mat = vr.head_to_eye_transform(eye);
+        let eye_mat = vr.head_to_eye_transform(eye);
         let scene_mat = scene.origin();
         let viewmodel_mat = eye_mat * hmd_mat * scene_mat;
         let trans = Trans { viewmodel: *viewmodel_mat.as_ref(),