unified hoverlabel: fix code style

Author: antoinerg

src/components/legend/style.js

@@ -290,8 +290,9 @@ module.exports = function style(s, gd, legend) {
 
     function styleWaterfalls(d) {
         var trace = d[0].trace;
+        var isWaterfall = trace.type === 'waterfall';
 
-        if(d[0]._distinct && trace.type === 'waterfall') {
+        if(d[0]._distinct && isWaterfall) {
             var cont = d[0].trace[d[0].dir].marker;
             d[0].mc = cont.color;
             d[0].mlw = cont.line.width;
@@ -300,7 +301,7 @@ module.exports = function style(s, gd, legend) {
         }
 
         var ptsData = [];
-        if(trace.visible && trace.type === 'waterfall') {
+        if(trace.visible && isWaterfall) {
             ptsData = d[0].hasTotals ?
                 [['increasing', 'M-6,-6V6H0Z'], ['totals', 'M6,6H0L-6,-6H-0Z'], ['decreasing', 'M6,6V-6H0Z']] :
                 [['increasing', 'M-6,-6V6H6Z'], ['decreasing', 'M6,6V-6H-6Z']];