remove unnecessary if check

Author: davisjam

lib/marked.js

@@ -1357,14 +1357,8 @@ function splitCells(tableRow, count) {
 
 // Remove trailing 'c's. Equivalent to str.replace(/c*$/, '').
 // /c*$/ is vulnerable to REDOS.
-// invert: Remove suffix of non-c chars instead. Default false.
+// invert: Remove suffix of non-c chars instead. Default falsey.
 function rtrim(str, c, invert) {
-  if (typeof invert === 'undefined' || !invert) {
-    invert = false;
-  } else {
-    invert = true;
-  }
-
   if (str.length === 0) {
     return '';
   }