winhttp: Avoid freeing potentially uninitialized context in netconn_secure_connect().

Signed-off-by: Paul Gofman <pgofman@codeweavers.com>
Signed-off-by: Hans Leidekker <hans@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/winhttp/net.c

@@ -293,6 +293,7 @@ DWORD netconn_secure_connect( struct netconn *conn, WCHAR *hostname, DWORD secur
 
     if (!(read_buf = malloc( read_buf_size ))) return ERROR_OUTOFMEMORY;
 
+    memset( &ctx, 0, sizeof(ctx) );
     status = InitializeSecurityContextW(cred_handle, NULL, hostname, isc_req_flags, 0, 0, NULL, 0,
             &ctx, &out_desc, &attrs, NULL);