Fix CID 234

Those multi-lines are still to be done (it's going to be fun...)
See also 5af4cc85.

default aac-profile to low instead of main

If someone understands the stochastic process whereby GCC decides to
apply this function or not, please let me know.

vout_intf: do not vlc_object_release() the cache object since it no more obtained through vlc_object_find

Signed-off-by: Rémi Duraffort <ivoire@videolan.org>