Initialize inputBuf to zero.

pdf.js

@@ -1553,7 +1553,7 @@ var CCITTFaxStream = (function() {
     this.row = 0;
     this.nextLine2D = this.encoding < 0;
     this.inputBits = 0;
-    this.inputBuf = EOF;
+    this.inputBuf = 0;
     this.outputBits = 0;
     this.buf = EOF;