net/mlx5: Remove redundant error on give pages

If give pages was triggered by FW event and FW failed the command,
the driver should ignore as FW is aware and will handle it.

The downstream patch will add a debugfs counter on this flow for
debuggability.

Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>