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>

1 files changed, 4 insertions, 0 deletions

diff --git a/mkfontscale.c b/mkfontscale.c
index d692e3c..2b07c67 100644
--- a/mkfontscale.c
+++ b/mkfontscale.c
@@ -971,6 +971,10 @@ doDirectory(const char *dirname_given, int numEncodings, ListPtr encodingsToDo)
                 char *s;
 
                 s = malloc(l - 10);
+                if (s == NULL) {
+                    fprintf(stderr, "Couldn't allocate xlfd name\n");
+                    exit(1);
+                }
                 memcpy(s, xlfd_name, l - 11);
                 s[l - 11] = '\0';
                 xlfd = listCons(s, xlfd);