vncserver: extract AskUserToChooseDeOrManualXstartup()

unix/vncserver

@@ -78,11 +78,6 @@ chop($host = `uname -n`);
 # Create the user's vnc directory if necessary.
 &CreateDotVncDir();
 
-$selectDeCmd = "builder/startup/deb/select-de.sh";
-if (!$skipxstartup) {
-   system($selectDeCmd);
-}
-
 # Find display number.
 if ((@ARGV > 0) && ($ARGV[0] =~ /^:(\d+)$/)) {
     $displayNumber = $1;
@@ -951,3 +946,10 @@ sub CreateDotVncDir {
       }
    }
 }
+
+sub AskUserToChooseDeOrManualXstartup {
+   $selectDeCmd = "builder/startup/deb/select-de.sh";
+   if (!$skipxstartup) {
+      system($selectDeCmd) == 0 || die("Failed to execute $selectDeCmd\n");
+   }
+}