RDMA/counter: Fix incorrect port index in rdma_counter_init() error cleanup

RDMA/counter: Fix incorrect port index in rdma_counter_init() error cleanup

The error cleanup loop in rdma_counter_init() iterates with variable
'i' but accesses dev->port_data[port] instead of dev->port_data[i].
This causes the failed port's hstats to be freed multiple times while
leaking hstats of previously initialized ports.

Fixes: 56594ae1d250 ("RDMA/core: Annotate destroy of mutex to ensure that it is released as unlocked")
Link: https://patch.msgid.link/r/20260520104546.1776253-3-cuitao@kylinos.cn
Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>