Fix CSI failure path
Fix CSI failure path

Since connect_by_classname() can return NULL without it being an
error condition, printing the status message is not valid unless you
check the s.rc field.  I don't think the message adds much here, since there
is only one place that the message is filled out, and it's a static string.
Instead, change the debug message to something useful to avoid the SEGV.

Signed-off-by: Dan Smith <787803eb1755f35291827d0f0268aa9bc7a57464@us.ibm.com>

libvirt/libvirt-cim,libvirt/libvirt-cim,libvirt/libvirt-cim