Add missing config options, and make prep really fail when it should

config-generic

@@ -1597,6 +1597,8 @@ CONFIG_CAN_KVASER_PCI=m
 CONFIG_CAN_PLX_PCI=m
 CONFIG_CAN_TSCAN1=m
 CONFIG_CAN_SLCAN=m
+CONFIG_CAN_SOFTING=m
+CONFIG_CAN_SOFTING_CS=m
 # CONFIG_PCH_CAN is not set
 CONFIG_NETROM=m
 CONFIG_ROSE=m

kernel.spec

@@ -1378,7 +1378,7 @@ do
 %if %{listnewconfig_fail}
   if [ -s .newoptions ]; then
     cat .newoptions
-    exit 0
+    exit 1
   fi
 %endif
   rm -f .newoptions