channels: patch rdpdr/smartcard valgrind leaks, fix hang on disconnect

docs/valgrind.supp

@@ -12,6 +12,16 @@
    fun:getaddrinfo
 }
 
+{
+   ignore pcsc-lite SCardConnect
+   Memcheck:Param
+   socketcall.sendto(msg)
+   fun:send
+   fun:MessageSend
+   fun:MessageSendWithHeader
+   fun:SCardConnect
+}
+
 {
   ignore openssl malloc
   Memcheck:Leak