job-list: fix potential double free of a hostlist struct

Problem: In the job-list hostlist match function, if an append to the
list of hostlist structs fails, then a double free of the hostlist
could occur since `goto error` already destroys the hostlist.

Remove the extra hostlist_destroy() in the error path.

src/modules/job-list/match.c

@@ -505,7 +505,6 @@ static struct list_constraint *create_hostlist_constraint (
     }
     if (!zlistx_add_end (c->values, hl)) {
         errprintf (errp, "failed to append hostlist structure");
-        hostlist_destroy (hl);
         goto error;
     }
     return c;