More NULL pointer fixes

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/vnc_keysym.h b/vnc_keysym.h
index 2d255c9..55cb87e 100644
--- a/vnc_keysym.h
+++ b/vnc_keysym.h
@@ -320,5 +320,5 @@
 {"Katakana_Real", 0xff25},
 {"Eisu_toggle", 0xff30},
 
-{0,0},
+{NULL,0},
 };