Fix errors reported by the `no-cond-assign` ESLint rule

http://eslint.org/docs/rules/no-cond-assign

src/shared/util.js

@@ -2166,7 +2166,7 @@ if (typeof PDFJSDev === 'undefined' || !PDFJSDev.test('MOZCENTRAL')) {
               err('\\ not allowed in relative path.');
             }
             var tmp;
-            if (tmp = relativePathDotMapping[buffer.toLowerCase()]) {
+            if ((tmp = relativePathDotMapping[buffer.toLowerCase()])) {
               buffer = tmp;
             }
             if ('..' === buffer) {

web/compatibility.js

@@ -270,7 +270,7 @@ if (typeof PDFJS === 'undefined') {
       // initialize result and counters
       var bc = 0, bs, buffer, idx = 0, output = '';
       // get next character
-      buffer = input.charAt(idx++);
+      (buffer = input.charAt(idx++));
       // character found in table?
       // initialize bit storage and add its ascii value
       ~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,