panic/foramt lint

rtiow/renderer/src/vec3.rs

@@ -144,7 +144,7 @@ impl Index<usize> for Vec3 {
             0 => &self.x,
             1 => &self.y,
             2 => &self.z,
-            _ => panic!(format!("idx {} out of range for vec3", idx)),
+            _ => panic!("idx {} out of range for vec3", idx),
         }
     }
 }