be clearer at die message

src/lib66/ssexec_disable.c

@@ -233,7 +233,7 @@ int ssexec_disable(int argc, char const *const *argv,char const *const *envp,sse
             stralloc sa = STRALLOC_ZERO ;
             r = ss_resolve_svtree(&sa,name,0) ;
             if (r > 2)
-                log_dieu_nclean(LOG_EXIT_SYS,&cleanup,name," is set on different tree -- -R options is not allowed") ;
+                log_dieu_nclean(LOG_EXIT_SYS,&cleanup,"use -R option -- ",name," is set on different tree") ;
             stralloc_free(&sa) ;
         }