[compiler-rt] [scudo][NFC] Explicit type casting to avoid compiler warning (PR #83355)

[Thurston Dang via llvm-commits]

================
@@ -53,7 +53,7 @@ template <class SizeClassAllocator> struct TransferBatch {
   void moveNToArray(CompactPtrT *Array, u16 N) {
     DCHECK_LE(N, Count);
     memcpy(Array, Batch + Count - N, sizeof(Batch[0]) * N);
-    Count -= N;
+    Count -= static_cast<u16>(Count - N);
----------------
thurstond wrote:

These two lines are not equivalent. Should that be "Count = ..."?

https://github.com/llvm/llvm-project/pull/83355