outbin: Fix infinite dashes written to map file

Unfortunately, there is an assumption that the section name is bounded to '65'
characters and dashes have been appended so far. A simple fix for this report:

https://bugzilla.nasm.us/show_bug.cgi?id=3392564

We may need to cleanup further for those hardcoded numbers in decorating the
section info.

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>

output/outbin.c

@@ -606,6 +606,7 @@ static void bin_cleanup(void)
             fprintf(rf, "\n\n");
             list_for_each(s, sections) {
                 fprintf(rf, "---- Section %s ", s->name);
+                if (strlen(s->name) < 65)
                 for (h = 65 - strlen(s->name); h; h--)
                     fputc('-', rf);
                 fprintf(rf, "\n\nclass:     ");