Prevent signed integer overflow in complex path of calc_qmfBuffer(). Bug: 186706541 Test: atest android.media.cts.DecoderTestAacFormat android.media.cts.DecoderTestXheAac android.media.cts.DecoderTestAacDrc Change-Id: Iae0581ea983912bcf1bc6b3bdc2c0d8ee2f6248e