net/mlx5: remove unneeded semicolon

Fix the following coccicheck warnings:

./drivers/net/ethernet/mellanox/mlx5/core/sf/devlink.c:495:2-3: Unneeded
semicolon.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>