[ATM]: [ambassador] Fix the sparse warning "implicit cast to nocast type"

Signed-off-by: NVictor Fusco <victor@cetuc.puc-rio.br>
Signed-off-by: NDomen Puncer <domen@coderock.org>
Signed-off-by: NChas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/atm/ambassador.c

@@ -794,7 +794,9 @@ static void drain_rx_pools (amb_dev * dev) {
     drain_rx_pool (dev, pool);
 }
 
-static inline void fill_rx_pool (amb_dev * dev, unsigned char pool, int priority) {
+static inline void fill_rx_pool (amb_dev * dev, unsigned char pool,
+                                 unsigned int __nocast priority)
+{
   rx_in rx;
   amb_rxq * rxq;