IB/iser: Fix typo in comment

Spelling mistake (triple letters) in comment.
Detected with the help of Coccinelle.

Link: https://lore.kernel.org/r/20220521111145.81697-4-Julia.Lawall@inria.fr
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Acked-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/ulp/iser/iscsi_iser.h

@@ -363,7 +363,7 @@ struct iser_fr_pool {
  * @cq:                  Connection completion queue
  * @cq_size:             The number of max outstanding completions
  * @device:              reference to iser device
- * @fr_pool:             connection fast registration poool
+ * @fr_pool:             connection fast registration pool
  * @pi_support:          Indicate device T10-PI support
  * @reg_cqe:             completion handler
  */