net/mlx5: DR: Fix incorrect type in return expression

dr_ste_crc32_calc() calculates crc32 and should return it in HW format.
It is being used to calculate a u32 index, hence we force the return value
of u32 to avoid the sparse warning:

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste.c:115:16:
warning: incorrect type in return expression (different base types)
    expected unsigned int
    got restricted __be32 [usertype]
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste.c

@@ -112,7 +112,7 @@ static u32 dr_ste_crc32_calc(const void *input_data, size_t length)
 {
 	u32 crc = crc32(0, input_data, length);
 
-	return htonl(crc);
+	return (__force u32)htonl(crc);
 }
 
 u32 mlx5dr_ste_calc_hash_index(u8 *hw_ste_p, struct mlx5dr_ste_htbl *htbl)