gsu: simplify banner message.

This was unnecessarily complex and caused an error if set -u
was used.

diff --git a/misc/gsu/subcommand b/misc/gsu/subcommand
index 1758f13..a13d3b2 100644 (file)
--- a/misc/gsu/subcommand
+++ b/misc/gsu/subcommand
@@ -186,13 +186,8 @@ _com_man()
 
 _gsu_banner_msg()
 {
-       local txt="### $_gsu_self --"
-       if test -z "$gsu_banner_txt"; then
-               txt="$txt set \$gsu_banner_txt to customize this message"
-       else
-               txt="$txt $gsu_banner_txt"
-       fi
-       gsu_short_msg "$txt ###"
+       gsu_banner_txt="${gsu_banner_txt:-set \$gsu_banner_txt to customize this message}"
+       gsu_short_msg "### $_gsu_self -- ###"
 }
 
 export gsu_help_txt="