pimd: Fix attempted out of bounds read when deleteing an interface.

https://savannah.nongnu.org/support/index.php?108542
pimd: Fix igmp_source_forward_stop called when IGMP forwarding flag is not set in oif_flags.

https://savannah.nongnu.org/support/index.php?108542
pimd: Fix invalid memory read when receiving a V1 or V2 query.

https://savannah.nongnu.org/support/index.php?108542