Update non_null.rs

Author: Dhvani-Kapadia

library/core/src/ptr/non_null.rs

@@ -1810,7 +1810,7 @@ impl<T: ?Sized> From<&T> for NonNull<T> {
 }
 
 #[cfg(kani)]
-#[unstable(feature = "kani", issue = "none")]
+#[unstable(feature="kani", issue="none")]
 mod verify {
     use super::*;
     use crate::ptr::null_mut;
@@ -1829,11 +1829,7 @@ mod verify {
     pub fn non_null_check_new() {
         let mut x: i32 = kani::any();
         let xptr = &mut x;
-        let maybe_null_ptr = if kani::any() {
-            xptr as *mut i32
-        } else {
-            null_mut()
-        };
+        let maybe_null_ptr = if kani::any() { xptr as *mut i32 } else { null_mut() };
         let _ = NonNull::new(maybe_null_ptr);
     }