Fix maybe-uninitialized warning in ca_adapter_net_ssl.c

Fix maybe-uninitialized warning in ca_adapter_net_ssl.c

The compilar was warning that the variables macKeyLen, ivSize, and keySize
could be used uninitialized. Very unlikely but really easy to fix.

Change-Id: Ie3a8872194c3ffe3a43576cdc399f8a1e99e3387
Signed-off-by: George Nash <george.nash@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/16799
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-by: Kevin Kane <kkane@microsoft.com>
Reviewed-by: Mike Fenelon <mike.fenelon@microsoft.com>