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After an mkey is created, update the counter for pending mkeys before
reshceduling the work that is filling the cache.

Rescheduling the work with a full MR cache entry and a wrong 'pending'
counter will cause us to miss disabling the fill_to_high_water flag.
Thus leaving the cache full but with an indication that it's still
needs to be filled up to it's full size (2 * limit).
Next time an mkey will be taken from the cache, we'll unnecessarily
continue the process of filling the cache to it's full size.

Fixes: 57e70716

 ("RDMA/mlx5: Implement mkeys management via LIFO queue")
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/0f44f462ba22e45f72cb3d0ec6a748634086b8d0.1725362530.git.leon@kernel.org

Signed-off-by: Leon Romanovsky <leon@kernel.org>