Clears gcc warning of:

info.c: In function ‘DisplayProps’:
info.c:214:44: warning: ‘snprintf’ output may be truncated before the
 last format character [-Wformat-truncation=]
       snprintf (number, sizeof(number), "%d", propnum);
                                            ^
info.c:214:7: note: ‘snprintf’ output between 2 and 11 bytes into a
 destination of size 10
       snprintf (number, sizeof(number), "%d", propnum);
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>