Fix DHCP NAK bombs on Windows 7

It's been reported DHCP NAK flooding in the event log in some situations,
and often related to restoring from a suspend/hibernate condition.

This fix has been tested by the community.

Trac-ticket: 97
Reported-by: Jan Just Keijser <janjust@nikhef.nl>
Suggested-by: ert <ert@csp.at>
Tested-by: ert <ert@csp.at>
Reviewed-by: James Yonan <james@openvpn.net>
Signed-off-by: David Sommerseth <davids@redhat.com>

src/dhcp.c

@@ -443,7 +443,7 @@ ProcessDHCP (TapAdapterPointer p_Adapter,
     p_Adapter->m_dhcp_received_discover = TRUE;
 
   // Is this a bad DHCPREQUEST?
-  if (msg_type == DHCPREQUEST && dhcp->ciaddr != p_Adapter->m_dhcp_addr)
+  if (msg_type == DHCPREQUEST && dhcp->ciaddr && dhcp->ciaddr != p_Adapter->m_dhcp_addr)
     ++p_Adapter->m_dhcp_bad_requests;
 
   return TRUE;

version.m4

@@ -1,6 +1,6 @@
 dnl define the TAP version
 define([PRODUCT_NAME], [TAP-Windows])
-define([PRODUCT_VERSION], [9.9.1])
+define([PRODUCT_VERSION], [9.9.2])
 define([PRODUCT_VERSION_RESOURCE], [9,0,0,9])
 define([PRODUCT_TAP_WIN_COMPONENT_ID], [tap0901])
 define([PRODUCT_TAP_WIN_MAJOR], [9])