btl/openib: don't complain about no NICs

Since openib is on its long, slow way out the door, don't let it
complain about not being able to find any NICs at run time.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

opal/mca/btl/openib/btl_openib_component.c

@@ -2808,7 +2808,6 @@ btl_openib_component_init(int *num_btl_modules,
     ib_devs = opal_ibv_get_device_list(&num_devs);
 
     if(0 == num_devs || NULL == ib_devs) {
-        mca_btl_base_error_no_nics("OpenFabrics (openib)", "device");
         goto no_btls;
     }