windows7: Silence false positive truncation warning.

Author: briansmith

src/windows7.rs

@@ -25,8 +25,10 @@ const TRUE: BOOLEAN = 1u8;
 
 pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
     // Prevent overflow of u32
-    for chunk in dest.chunks_mut(u32::max_value() as usize) {
-        let ret = unsafe { RtlGenRandom(chunk.as_mut_ptr().cast::<c_void>(), chunk.len() as u32) };
+    for chunk in dest.chunks_mut(u32::MAX as usize) {
+        #[allow(clippy::cast_possible_truncation)]
+        let chunk_len = chunk.len() as u32;
+        let ret = unsafe { RtlGenRandom(chunk.as_mut_ptr().cast::<c_void>(), chunk_len) };
         if ret != TRUE {
             return Err(Error::WINDOWS_RTL_GEN_RANDOM);
         }