bash-completion: list valid signal names

this is a follow-up for commit 18540892d18addc4dcb81

diff --git a/shell-completion/bash/loginctl b/shell-completion/bash/loginctl
index 7a083d28756cde70594649ea676402b589bebdec..776eca4e626aeded37569c7e75f0c8d296287add 100644 (file)
--- a/shell-completion/bash/loginctl
+++ b/shell-completion/bash/loginctl
@@ -41,7 +41,8 @@ _loginctl () {
         if __contains_word "$prev" ${OPTS[ARG]}; then
                 case $prev in
                         --signal|-s)
-                                comps=$(compgen -A signal)
+                                _signals
+                                return
                         ;;
                         --kill-who)
                                 comps='all leader'