IB/mlx5: avoid destroying a NULL mr in reg_user_mr error flow
commit 11d74804 upstream. The mlx5_ib_reg_user_mr() function will attempt to call clean_mr() in its error flow even though there is never a case where the error flow occurs with a valid MR pointer to destroy. Remove the clean_mr() call and the incorrect comment above it. Fixes: b4cfe447 ("IB/mlx5: Implement on demand paging by adding support for MMU notifiers") Cc: Eli Cohen <eli@mellanox.com> Signed-off-by: Haggai Eran <haggaie@mellanox.com> Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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