SoftAMR: check output buffer size to avoid overflow.

Bug: 27662364
Change-Id: I7b26892c41d6f2e690e77478ab855c2fed1ff6b0

android::SoftOMXComponent *createSoftOMXComponent(
 const char *name, const OMX_CALLBACKTYPE *callbacks,
        OMX_PTR appData, OMX_COMPONENTTYPE **component) {
 return new android::SoftAMR(name, callbacks, appData, component);
}

android::SoftOMXComponent *createSoftOMXComponent(
 const char *name, const OMX_CALLBACKTYPE *callbacks,
        OMX_PTR appData, OMX_COMPONENTTYPE **component) {
 return new android::SoftAMR(name, callbacks, appData, component);
}
