security: handle missing switch enum cases

Ensure all enum cases are listed in switch statements.

Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

src/security/security_driver.c

@@ -82,6 +82,7 @@ virSecurityDriverPtr virSecurityDriverLookup(const char *name,
             }
             break;
 
+        case SECURITY_DRIVER_ERROR:
         default:
             return NULL;
         }