Fix a few nightly clippy lints (#8388)

crates/emath/src/easing.rs

@@ -7,6 +7,8 @@
 //! Derived from <https://github.com/warrenm/AHEasing/blob/master/AHEasing/easing.c>.
 use std::f32::consts::PI;
 
+use crate::fast_midpoint;
+
 #[inline]
 fn powf(base: f32, exp: f32) -> f32 {
     base.powf(exp)
@@ -116,7 +118,7 @@ pub fn circular_in_out(t: f32) -> f32 {
     if t < 0.5 {
         0.5 * (1. - (1. - 4. * t * t).sqrt())
     } else {
-        0.5 * ((-(2. * t - 3.) * (2. * t - 1.)).sqrt() + 1.)
+        fast_midpoint((-(2. * t - 3.) * (2. * t - 1.)).sqrt(), 1.)
     }
 }
 

crates/emath/src/range.rs

@@ -1,5 +1,7 @@
 use std::ops::{RangeFrom, RangeFull, RangeInclusive, RangeToInclusive};
 
+use crate::fast_midpoint;
+
 /// Inclusive range of floats, i.e. `min..=max`, but more ergonomic than [`RangeInclusive`].
 #[repr(C)]
 #[derive(Clone, Copy, Debug, PartialEq)]
@@ -52,7 +54,7 @@ impl Rangef {
     /// The center of the range
     #[inline]
     pub fn center(self) -> f32 {
-        0.5 * (self.min + self.max)
+        fast_midpoint(self.min, self.max)
     }
 
     #[inline]