fix warp assert on pow of 2

Author: 39ali

crates/cuda_std/src/warp.rs

@@ -766,7 +766,7 @@ unsafe fn warp_shuffle_32(
     }
 
     assert!(
-        !(width & (width - 1)) != 0 && width <= 32,
+        width != 0 && (width & (width - 1)) == 0 && width <= 32,
         "width must be a power of 2 and less than or equal to 32"
     );