[goffice] Compilation: warning fix.

[Morten Welinder <mortenw src gnome org>]

commit 468b7551fecb2e2cb88d858002ed81ecb9eeb1df
Author: Morten Welinder <terra gnome org>
Date:   Tue May 3 09:08:55 2011 -0400

    Compilation: warning fix.

 goffice/utils/go-format.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/goffice/utils/go-format.c b/goffice/utils/go-format.c
index 8c87799..95e1820 100644
--- a/goffice/utils/go-format.c
+++ b/goffice/utils/go-format.c
@@ -196,6 +196,7 @@ typedef enum {
 } GOFormatOp;
 
 typedef enum {
+	TOK_NULL = 0,
 	TOK_GENERAL = 256,	/* General	*/
 
 	TOK_STRING,		/* "xyz"	*/
@@ -1194,7 +1195,7 @@ handle_common_token (const char *tstr, GOFormatToken t, GString *prg)
 		break;
 	}
 
-	case 0:
+	case TOK_NULL:
 		break;
 
 	default: