AudioFlinger: Fix memory allocation for client-less tracks am: 1159ffd5e3 am: f242b890c4 am: 24ef54ecb8 am: a35816475b am: 1ce123cf91 am: d06e47540d am: 103b751e55 am: 0851e2f4c6
am: aff0808bcf

Change-Id: I4c7698da6176547fd9ebc23ae52e2e9e53e83f61