net/mlx5e: simplify condition after napi budget handling change

Since recent commit budget can't be 0 here.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c

@@ -207,7 +207,7 @@ int mlx5e_napi_poll(struct napi_struct *napi, int budget)
 		}
 		ch_stats->aff_change++;
 		aff_change = true;
-		if (budget && work_done == budget)
+		if (work_done == budget)
 			work_done--;
 	}