Show each overlay only once #1675

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/app/wwctl/overlay/build/root.go

@@ -39,7 +39,7 @@ func init() {
 	baseCmd.PersistentFlags().StringSliceVarP(&OverlayNames, "overlay", "O", []string{}, "Build only specific overlay(s)")
 
 	if err := baseCmd.RegisterFlagCompletionFunc("overlay", func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
-		list, _ := overlay.FindOverlays()
+		list := overlay.FindOverlays()
 		return list, cobra.ShellCompDirectiveNoFileComp
 	}); err != nil {
 		log.Println(err)