[PATCH] net/mlx5: fix compilation warning in GCC-9.1

[Gregory Etelson <getelson@nvidia.com>]

GCC has introduced a bugfix in 9.1 that changed GCC ABI in ARM setups:
https://gcc.gnu.org/gcc-9/changes.html
```
On Arm targets (arm*-*-*), a bug in the implementation of the
procedure call standard (AAPCS) in the GCC 6, 7 and 8 releases
has been fixed: a structure containing a bit-field based on a 64-bit
integral type and where no other element in a structure required
64-bit alignment could be passed incorrectly to functions.
This is an ABI change. If the option -Wpsabi is enabled
(on by default) the compiler will emit a diagnostic note for code
that might be affected.
```

The patch fixes PMD compilation in the INTEGRITY flow item.

Fixes: 23b0a8b298b1 ("net/mlx5: fix integrity item validation and translation")

Cc: stable@dpdk.org

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Dariusz Sosnowski <dsosnowski@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow_dv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 8a0d58cb05..89057edbcf 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -7396,11 +7396,13 @@ flow_dv_validate_attributes(struct rte_eth_dev *dev,
 }
 
 static int
-validate_integrity_bits(const struct rte_flow_item_integrity *mask,
+validate_integrity_bits(const void *arg,
 			int64_t pattern_flags, uint64_t l3_flags,
 			uint64_t l4_flags, uint64_t ip4_flag,
 			struct rte_flow_error *error)
 {
+	const struct rte_flow_item_integrity *mask = arg;
+
 	if (mask->l3_ok && !(pattern_flags & l3_flags))
 		return rte_flow_error_set(error, EINVAL,
 					  RTE_FLOW_ERROR_TYPE_ITEM,
-- 
2.43.0