asoc: add limit checks for copp index

Check the validity of copp index before calling
adm_close. This avoids redundant error logs in
adm_close.

CRs-Fixed: 2330388
Change-Id: I0b1cef5a45298fe9cbc84d9b944f6f10cec562df
Signed-off-by: Vignesh Kulothungan <vigneshk@codeaurora.org>