mlx5/mcast: fix inet_ntop argument for IPv6 address

[janjust]

Debug output of MLX5 TL prints garbage IPv6 addresses during the multicast initialization/teardown phase.

Pass sin6_addr field instead of the full sockaddr_in6 struct to inet_ntop(AF_INET6, ...), which expects a struct in6_addr pointer.

[janjust]

/build

[greptile-apps]

Greptile Summary

This PR fixes two inet_ntop(AF_INET6, ...) calls that were incorrectly passing a struct sockaddr_in6 * where a struct in6_addr * is required. Both sites now correctly pass the sin6_addr member, which eliminates the garbage IPv6 address strings in debug output during multicast join and leave operations.

Confidence Score: 5/5

Safe to merge — minimal, targeted fix with no side effects beyond correcting debug output.

Both changes are straightforward and correct: inet_ntop(AF_INET6, ...) requires a struct in6_addr *, and the fix supplies exactly that. The third inet_ntop call in the file (line 257) already passes a raw byte array which is correct. No logic, data flow, or error handling is affected.

No files require special attention.

Important Files Changed

Filename	Overview
src/components/tl/mlx5/mcast/tl_mlx5_mcast_helper.c	Fixes two incorrect inet_ntop calls by passing sin6_addr field instead of the full sockaddr_in6 struct, correcting garbage IPv6 debug output.

_{Reviews (2): Last reviewed commit: "MLX5: fix inet_ntop mcast addr pointer t..." | Re-trigger Greptile}

[janjust]

/build