libctf: fix dict leak on archive-wide symbol lookup error path

If a lookup fails for a reason unrelated to a lack of type data for this
symbol, we return with an error; but we fail to close the dict we opened
most recently, which is leaked.

libctf/
	* ctf-archive.c (ctf_arc_lookup_sym_or_name): Close dict.

libctf/ctf-archive.c

@@ -957,6 +957,7 @@ ctf_arc_lookup_sym_or_name (ctf_archive_t *wrapper, unsigned long symidx,
 	{
 	  if (errp)
 	    *errp = ctf_errno (fp);
+	  ctf_dict_close (fp);
 	  ctf_next_destroy (i);
 	  return NULL;				/* errno is set for us.  */
 	}