RDMA/rtrs-clt: use find_next_zero_bit() for permit allocation

__rtrs_get_permit() scans permits_map with find_first_zero_bit() and
claims the bit with test_and_set_bit_lock(), restarting from bit 0 on a
lost race.  Use find_next_zero_bit() to resume from the last position so
a lost race does not rescan the already-set low bits; on reaching the
end, wrap to the beginning to exhaust the map.

Compile-tested: arm64 defconfig + INFINIBAND_RTRS_CLIENT=m, rtrs-clt.o
Reviewed-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Liu Zhenlong <dragonliu2018@gmail.com>
Link: https://patch.msgid.link/20260818163513.53875-1-dragonliu2018@gmail.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

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