[PATCH] fix bug in print loadable builtin

[Emanuele Torre]

ansicstr() returns NULL when the string argument is the empty string, so
passing its return value to fprintf() will cause a segmentation fault.

That happened when one of the arguments was the empty string and the
`-r' option was not used.

example:
    bash-5.1$ enable -f /usr/lib/bash/print print
    bash-5.1$ (print '')
    Segmentation fault (core dumped)
    bash-5.1$ (print -r '')

    bash-5.1$ (print a '' b)
    Segmentation fault (core dumped)
---
 examples/loadables/print.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/examples/loadables/print.c b/examples/loadables/print.c
index 0120dbf4..6be2778a 100644
--- a/examples/loadables/print.c
+++ b/examples/loadables/print.c
@@ -181,8 +181,11 @@ printargs (list, ofp)
   for (sawc = 0, l = list; l; l = l->next)
     {
       ostr = ansicstr (l->word->word, strlen (l->word->word), 0, &sawc, (int 
*)0);
-      fprintf (ofp, "%s", ostr);
-      free (ostr);
+      if (ostr)
+        {
+          fprintf (ofp, "%s", ostr);
+          free (ostr);
+        }
       if (sawc)
         return (0);
       if (l->next)
-- 
2.36.0