CRAS: rclient - Clean up fd and rstream in add_stream.
CRAS: rclient - Clean up fd and rstream in add_stream.

If the reply to acknowledge that a stream has been added fails, make
sure to clean up all the bits that have already been allocated.  This
will also try to send an error response which won't likely succeed,
but won't hurt either.

BUG=none
TEST=play several streams on link.

Change-Id: I1509eb88dd3db4baa275d14ae6485bd0cb56b231
Signed-off-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/169929
Reviewed-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>

drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd