doDirectory: add missing check for malloc() returning NULL

Resolves gcc analyzer warning:

mkfontscale.c: In function ‘doDirectory’:
mkfontscale.c:974:17: warning: use of possibly-NULL ‘s’ where non-null expected [CWE-690] [-Wanalyzer-possible-null-argument]
  974 |                 memcpy(s, xlfd_name, l - 11);
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

0 files changed, 0 insertions, 0 deletions