clippy: fix redundant_closure warnings

src/geometry/quaternion.rs

@@ -520,16 +520,13 @@ where
         let v = self.vector();
         let nn = v.norm_squared();
         let le = nn.simd_le(eps * eps);
-        le.if_else(
-            || Self::identity(),
-            || {
+        le.if_else(Self::identity, || {
             let w_exp = self.scalar().simd_exp();
             let n = nn.simd_sqrt();
             let nv = v * (w_exp * n.simd_sin() / n);
 
             Self::from_parts(w_exp * n.simd_cos(), nv)
-            },
-        )
+        })
     }
 
     /// Raise the quaternion to a given floating power.

src/geometry/rotation_specialization.rs

@@ -453,7 +453,7 @@ where
                     sqz + (N::one() - sqz) * cos,
                 ))
             },
-            || Self::identity(),
+            Self::identity,
         )
     }