Fix computation of tzspec_len.

Without this it should never have worked that we can use the
embedded envvar in the timezone data files for dates after the last
matching rule.

ChangeLog

@@ -1,5 +1,7 @@
 2009-06-15  Ulrich Drepper  <drepper@redhat.com>
 
+	* time/tzfile.c (__tzfile_read): Correct computation of tzspec_len.
+
 	[BZ #10211]
 	* time/tzfile.c (__tzfile_compute): If we use the envvar format still
 	handle leap seconds if they are available.

time/tzfile.c

@@ -248,7 +248,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
 				+ num_transitions * (8 + 1)
 				+ num_types * 6
 				+ chars
-				+ num_leaps * 8
+				+ num_leaps * 12
 				+ num_isstd
 				+ num_isgmt) - 1 : 0);