quic: use the safe fused multiply divide instead of a safe multiply t…

…hen a normal division

This should extend the range of possible results.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from #21429)

ssl/quic/quic_fc.c

@@ -236,8 +236,8 @@ static int rxfc_cwm_bump_desired(QUIC_RXFC *rxfc)
     int err = 0;
     uint64_t window_rem = rxfc->cwm - rxfc->rwm;
     uint64_t threshold
-        = safe_mul_uint64_t(rxfc->cur_window_size,
-                            WINDOW_THRESHOLD_NUM, &err) / WINDOW_THRESHOLD_DEN;
+        = safe_muldiv_uint64_t(rxfc->cur_window_size,
+                               WINDOW_THRESHOLD_NUM, WINDOW_THRESHOLD_DEN, &err);
 
     if (err)
         /*