Fixed cast in endpoint_cfstream.cc

src/core/lib/iomgr/endpoint_cfstream.cc

@@ -182,7 +182,7 @@ static void ReadAction(void* arg, grpc_error* error) {
                    GRPC_ERROR_CREATE_FROM_STATIC_STRING("Socket closed"), ep));
     EP_UNREF(ep, "read");
   } else {
-    if (read_size < len) {
+    if (read_size < static_cast<CFIndex>(len)) {
       grpc_slice_buffer_trim_end(ep->read_slices, len - read_size, nullptr);
     }
     CallReadCb(ep, GRPC_ERROR_NONE);
@@ -217,7 +217,7 @@ static void WriteAction(void* arg, grpc_error* error) {
     CallWriteCb(ep, error);
     EP_UNREF(ep, "write");
   } else {
-    if (write_size < GRPC_SLICE_LENGTH(slice)) {
+    if (write_size < static_cast<CFIndex>(GRPC_SLICE_LENGTH(slice))) {
       grpc_slice_buffer_undo_take_first(
           ep->write_slices, grpc_slice_sub(slice, write_size, slice_len));
     }