[PATCH] winspool.drv: Stop crash when PortName is NULL

[Alistair Leslie-Hughes]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=33502
Signed-off-by: Alistair Leslie-Hughes 
---
 dlls/winspool.drv/info.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dlls/winspool.drv/info.c b/dlls/winspool.drv/info.c
index 7c4ee9a..ea4afec 100644
--- a/dlls/winspool.drv/info.c
+++ b/dlls/winspool.drv/info.c
@@ -1572,7 +1572,8 @@ static void old_printer_check( BOOL delete_phase )
     EnumPrintersW( PRINTER_ENUM_LOCAL, NULL, 5, (LPBYTE)pi, needed, &needed, &num );
     for (i = 0; i < num; i++)
     {
-        if (strncmpW( pi[i].pPortName, CUPS_Port, strlenW(CUPS_Port) ) &&
+        if (pi[i].pPortName &&
+            strncmpW( pi[i].pPortName, CUPS_Port, strlenW(CUPS_Port) ) &&
             strncmpW( pi[i].pPortName, LPR_Port, strlenW(LPR_Port) ))
             continue;