net/mlx5: Don't call give_pages() if request 0 page

net/mlx5: Don't call give_pages() if request 0 page

Firmware will return 0 on query BOOT/INIT PAGES for non-page supplier
functions (external host PF/VF/SF), so no page is needed to be
allocated for them.

Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20240402133043.56322-12-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>