[Bugfix] Add correct PlainPasswd constructor to avoid vncpasswd crash.

Reference: https://bugzilla.redhat.com/show_bug.cgi?id=499401


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@3812 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/rfb/Password.h b/common/rfb/Password.h
index ab26903..e5196ee 100644
--- a/common/rfb/Password.h
+++ b/common/rfb/Password.h
@@ -28,6 +28,7 @@
   public:
     PlainPasswd();
     PlainPasswd(char* pwd);
+    PlainPasswd(int len);
     PlainPasswd(const ObfuscatedPasswd& obfPwd);
     ~PlainPasswd();
     void replaceBuf(char* b);