Corrected CASelectNetwork() result check for stack initialization

Corrected CASelectNetwork() result check for stack initialization

In the case CA status is not initialized, CASelectNetwork() is not
called.

Change-Id: I6588b639e35a7f84c69a52550fe601fb9747c76f
Signed-off-by: hyuna0213.jo <hyuna0213.jo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10939
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>