Cleaned up else per golint

When an if ends in a return the else is not required. golint
detects these conditions and found these.

app.go

@@ -189,12 +189,11 @@ func (a *App) Run(arguments []string) (err error) {
 			err := a.OnUsageError(context, err, false)
 			HandleExitCoder(err)
 			return err
-		} else {
+		}
 		fmt.Fprintf(a.Writer, "%s\n\n", "Incorrect Usage.")
 		ShowAppHelp(context)
 		return err
 	}
-	}
 
 	if !a.HideHelp && checkHelp(context) {
 		ShowAppHelp(context)
@@ -310,12 +309,11 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 			err = a.OnUsageError(context, err, true)
 			HandleExitCoder(err)
 			return err
-		} else {
+		}
 		fmt.Fprintf(a.Writer, "%s\n\n", "Incorrect Usage.")
 		ShowSubcommandHelp(context)
 		return err
 	}
-	}
 
 	if len(a.Commands) > 0 {
 		if checkSubcommandHelp(context) {

command.go

@@ -132,13 +132,12 @@ func (c Command) Run(ctx *Context) (err error) {
 			err := c.OnUsageError(ctx, err, false)
 			HandleExitCoder(err)
 			return err
-		} else {
+		}
 		fmt.Fprintln(ctx.App.Writer, "Incorrect Usage.")
 		fmt.Fprintln(ctx.App.Writer)
 		ShowCommandHelp(ctx, c.Name)
 		return err
 	}
-	}
 
 	nerr := normalizeFlags(c.Flags, set)
 	if nerr != nil {

flag.go

@@ -182,9 +182,8 @@ func (f *IntSlice) Set(value string) error {
 	tmp, err := strconv.Atoi(value)
 	if err != nil {
 		return err
-	} else {
-		*f = append(*f, tmp)
 	}
+	*f = append(*f, tmp)
 	return nil
 }