mlxsw: spectrum_acl_tcam: Add missing mutex_destroy()

[ Upstream commit 65823e07 ]

Pair mutex_init() with a mutex_destroy() in the error path. Found during
code review. No functional changes.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 483ae90d ("mlxsw: spectrum_acl_tcam: Fix stack corruption")
Signed-off-by: Sasha Levin <sashal@kernel.org>