binder: refactor binder_pop_transaction
binder_pop_transaction needs to be split into 2 pieces to to allow the proc lock to be held on entry to dequeue the transaction stack, but no lock when kfree'ing the transaction. Split into binder_pop_transaction_locked and binder_free_transaction (the actual locks are still to be added). Signed-off-by: NTodd Kjos <tkjos@google.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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