[NetLabel]: add missing rcu_dereference() calls in the LSM domain mapping hash table
The LSM domain mapping head table pointer was not being referenced via the RCU
safe dereferencing function, rcu_dereference(). This patch adds those missing
calls to the NetLabel code.
This has been tested using recent linux-2.6 git kernels with no visible
regressions.
Signed-off-by: Paul Moore <paul.moore@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>