net/mlx5e: Fix error handling in mlx5e_refresh_tirs

[ Upstream commit b6193d70 ]

Allocation failure is outside the critical lock section and should
return immediately rather than jumping to the unlock section.

Also unlock as soon as required and remove the now redundant jump label.

Fixes: 80a2a902 ("net/mlx5e: Add a lock on tir list")
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>