remove leak in tr/ascii/utf8/

The recent change to use invlists left a bug in S_do_trans_invmap()
whereby it allocated a new temp buf if it knew the resulting string
would be too long, but failed to free the buffer at the end.

Showed up as smokes under ASAN failing these tests:

    op/tr_latin1.t
    op/tr.t
    uni/tr_utf8.t

1 files changed, 1 insertions, 0 deletions

diff --git a/doop.c b/doop.c
index 6db986b86b..3e62c8cf3b 100644
--- a/doop.c
+++ b/doop.c
@@ -523,6 +523,7 @@ S_do_trans_invmap(pTHX_ SV * const sv, AV * const invmap)
     s += s_len;
     if (! inplace) {
 	sv_setpvn(sv, (char*)d0, d - d0);
+        Safefree(d0);
     }
     else {
 	*d = '\0';