lib/clean.js: be consistent with the equal signs

diff --git a/lib/clean.js b/lib/clean.js
index 38e4649..05b488d 100644 (file)
--- a/lib/clean.js
+++ b/lib/clean.js
@@ -268,7 +268,7 @@ var CleanCSS = {
         return property + ':' + size1;
       else if (size1 === size3 && size2 === size4)
         return property + ':' + size1 + ' ' + size2;
-      else if (size2 == size4)
+      else if (size2 === size4)
         return property + ':' + size1 + ' ' + size2 + ' ' + size3;
       else
         return match;