wininet: Fix printing NULL strings.

[Francois Gouget]

---

This fixes a crash that occurred in the conformance tests on my Solaris 
VMs when tracing was turned on.

 dlls/wininet/ftp.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/dlls/wininet/ftp.c b/dlls/wininet/ftp.c
index 1b0a46b..74316b9 100644
--- a/dlls/wininet/ftp.c
+++ b/dlls/wininet/ftp.c
@@ -2651,7 +2651,7 @@ static BOOL FTP_SendCommandA(INT nSocket, FTP_COMMAND ftpCmd, LPCSTR lpszParam,
 	int nRC = 0;
 	DWORD dwParamLen;
 
-	TRACE("%d: (%s) %d\n", ftpCmd, lpszParam, nSocket);
+	TRACE("%d: (%s) %d\n", ftpCmd, debugstr_a(lpszParam), nSocket);
 
 	if (lpfnStatusCB)
         {
-- 
1.7.5.4