AudioFlinger: Fix memory allocation for client-less tracks am: 1159ffd5e3 am: f242b890c4 am: 24ef54ecb8 am: a35816475b am: 1ce123cf91 am: d06e47540d
am: 103b751e55

Change-Id: I3d03741eca351ad131d5bae700a5024fda36e1be