Added check for trailing whitespaces and corrected existing violations.

test/mjsunit/substr.js

Index: test/mjsunit/substr.js
diff --git a/test/mjsunit/substr.js b/test/mjsunit/substr.js
index cffaf94da2650eb4322a3d63c289c2e7c214e26c..cab8b1bf6dec00373ff13723ab71f2281ab0a494 100755
--- a/test/mjsunit/substr.js
+++ b/test/mjsunit/substr.js
@@ -55,7 +55,7 @@ assertEquals(s, s.substr(-100));
 assertEquals('abc', s.substr(-100, 3));
 assertEquals(s1, s.substr(-s.length + 1));
 
-// assertEquals('', s.substr(0, void 0)); // smjs and rhino 
+// assertEquals('', s.substr(0, void 0)); // smjs and rhino
 assertEquals('abcdefghijklmn', s.substr(0, void 0));  // kjs and v8
 assertEquals('', s.substr(0, null));
 assertEquals(s, s.substr(0, String(s.length)));