ipv4: Convert call_rcu() to kfree_rcu(), drop opt_kfree_rcu()
ipv4: Convert call_rcu() to kfree_rcu(), drop opt_kfree_rcu()

Because opt_kfree_rcu() just calls kfree(), all call_rcu() uses of it
may be converted to kfree_rcu().  This permits opt_kfree_rcu() to
be eliminated.

Signed-off-by: Paul E. McKenney <95dea50491c620faede961f7e6190a98a6df4edf@linaro.org>
Signed-off-by: Paul E. McKenney <1e0ce936bb9b355d257bf5790d2513c3f28be22b@linux.vnet.ibm.com>
Acked-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>
Cc: Alexey Kuznetsov <55346d3bc0c58d58503ceaa50b259ca76fcb3262@ms2.inr.ac.ru>
Cc: James Morris <10d11de3abc355eabe955bb734f0f8e71da56e16@namei.org>
Cc: Hideaki YOSHIFUJI <948b80da4254122ea1e8973dd9930d46b7654cf3@linux-ipv6.org>
Cc: Patrick McHardy <3a4d625ce225e891399f98db96a382ac4a84080b@trash.net>
Cc: 1099b3bee480025a15c1b622ecdea77a1d6d7166@vger.kernel.org

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs