In rte_vlan_insert there is a casting of rte_pktmbuf_prepend returned
value to (struct rte_ether_hdr *), which causes cast-align warning when
using gcc flags '-Werror -Wcast-align':

In file included from .../include/rte_ethdev.h:165,
                 from lib/netdev-dpdk.c:33:
.../include/rte_ether.h: In function 'rte_vlan_insert':
.../include/rte_ether.h:375:7: error: cast increases required alignment
    of target type [-Werror=cast-align]
  375 |  nh = (struct rte_ether_hdr *)
      |       ^

As the code assumes correct alignment, add first a (void *) casting, to
avoid the warning.

Fixes: c974021a5949 ("ether: add soft vlan encap/decap")
Cc: stable@dpdk.org

Signed-off-by: Eli Britstein <redacted>
---
 lib/net/rte_ether.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/net/rte_ether.h b/lib/net/rte_ether.h
index 7ee5e9a292..6e21155161 100644
--- a/lib/net/rte_ether.h
+++ b/lib/net/rte_ether.h

@@ -372,7 +372,7 @@ static inline int rte_vlan_insert(struct rte_mbuf **m)
 		return -EINVAL;
 
 	oh = rte_pktmbuf_mtod(*m, struct rte_ether_hdr *);
-	nh = (struct rte_ether_hdr *)
+	nh = (struct rte_ether_hdr *)(void *)
 		rte_pktmbuf_prepend(*m, sizeof(struct rte_vlan_hdr));
 	if (nh == NULL)
 		return -ENOSPC;

-- 
2.28.0.2311.g225365fb51