scsi: mpi3mr: struct mpi3_event_data_pcie_topology_change_list: Replace 1-element...

scsi: mpi3mr: struct mpi3_event_data_pcie_topology_change_list: Replace 1-element array with flexible array

Replace the deprecated[1] use of a 1-element array in struct
mpi3_event_data_pcie_topology_change_list with a modern flexible array.

Additionally add __counted_by annotation since port_entry is only ever
accessed in loops controlled by num_entries. For example:

        for (i = 0; i < event_data->num_entries; i++) {
                handle =
                    le16_to_cpu(event_data->port_entry[i].attached_dev_handle);

No binary differences are present after this conversion.

Link: https://github.com/KSPP/linux/issues/79
Signed-off-by: Kees Cook <kees@kernel.org>
Link: https://lore.kernel.org/r/20240711155637.3757036-2-kees@kernel.org
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>