src/utils.js: Fix missing/unnecessary semicolons

Fixes the following JSHint errors:

  ./src/utils.js: line 108, col 2, Unnecessary semicolon.
  ./src/utils.js: line 128, col 39, Missing semicolon.
  ./src/utils.js: line 140, col 4, Missing semicolon.

src/utils.js

@@ -105,7 +105,7 @@ function quote(s) {
     .replace(/\n/g, '\\n')             // line feed
     .replace(/[\x80-\uFFFF]/g, escape) // non-ASCII characters
     + '"';
-};
+}
 
 /*
  * Escapes characters inside the string so that it can be used as a list of
@@ -118,14 +118,14 @@ function quoteForRegexpClass(s) {
    * For portability, we also escape escape all non-ASCII characters.
    */
   return s
-    .replace(/\\/g, '\\\\')            // backslash
-    .replace(/\0/g, '\\0')             // null, IE needs this
-    .replace(/\//g, '\\/')             // closing slash
-    .replace(/]/g, '\\]')              // closing bracket
-    .replace(/-/g, '\\-')              // dash
-    .replace(/\r/g, '\\r')             // carriage return
-    .replace(/\n/g, '\\n')             // line feed
-    .replace(/[\x80-\uFFFF]/g, escape) // non-ASCII characters
+    .replace(/\\/g, '\\\\')             // backslash
+    .replace(/\0/g, '\\0')              // null, IE needs this
+    .replace(/\//g, '\\/')              // closing slash
+    .replace(/]/g, '\\]')               // closing bracket
+    .replace(/-/g, '\\-')               // dash
+    .replace(/\r/g, '\\r')              // carriage return
+    .replace(/\n/g, '\\n')              // line feed
+    .replace(/[\x80-\uFFFF]/g, escape); // non-ASCII characters
 }
 
 /*
@@ -137,5 +137,5 @@ function quoteForRegexpClass(s) {
 function buildNodeVisitor(functions) {
   return function(node) {
     return functions[node.type].apply(null, arguments);
-  }
+  };
 }