[nautilus] update ZERO_OR_THREE_DIGITS define to work as intended

[Cosimo Cecchi <cosimoc src gnome org>]

commit 84e0604672052a7ed9de2736ca6553b78bc8733a
Author: Sebastien Bacher <seb128 ubuntu com>
Date:   Fri Apr 27 12:09:32 2012 +0200

    update ZERO_OR_THREE_DIGITS define to work as intended
    
    https://bugzilla.gnome.org/show_bug.cgi?id=674924

 libnautilus-private/nautilus-icon-canvas-item.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libnautilus-private/nautilus-icon-canvas-item.c b/libnautilus-private/nautilus-icon-canvas-item.c
index 2faff83..4735e71 100644
--- a/libnautilus-private/nautilus-icon-canvas-item.c
+++ b/libnautilus-private/nautilus-icon-canvas-item.c
@@ -1471,7 +1471,7 @@ nautilus_icon_canvas_item_draw (EelCanvasItem *item,
 #define ZERO_WIDTH_SPACE "\xE2\x80\x8B"
 
 #define ZERO_OR_THREE_DIGITS(p) \
-	(!g_ascii_isdigit (*p) || \
+	(!g_ascii_isdigit (*(p)) || \
 	 (g_ascii_isdigit (*(p+1)) && \
 	  g_ascii_isdigit (*(p+2))))