Fixed Thread-unsafe code in caqueueingthread.c

Fixed Thread-unsafe code in caqueueingthread.c

mutex should be destroyed after deleting data queue.

Change-Id: I191d9519da47421d0e296d02cedd6af5eb757bdd
Signed-off-by: hyuna0213.jo <hyuna0213.jo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/16337
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-by: Mike Fenelon <mike.fenelon@microsoft.com>