https://bugs.freedesktop.org/show_bug.cgi?id=10267
Fixes following warning:
cairo-truetype-subset.c:698: warning: call to __builtin___snprintf_chk will always overflow destination buffer
================================================================================
--- src/cairo-truetype-subset.c
+++ src/cairo-truetype-subset.c
@@ -676,7 +676,7 @@
 cairo_truetype_font_write_post_table (cairo_truetype_font_t *font,
 				      unsigned long          tag)
 {
-    char buf[10];
+    char buf[11];
     int n;
     unsigned i;