Apply upstream commit 943a6621866e9d6e654f5cfe1494378c1fb8957a.

Author: Paul Eggert <eggert@cs.ucla.edu>
Date:   Thu Aug 22 12:47:51 2013 -0700

    * localtime.c: Fix another integer overflow bug in mktime.

    (time2sub): Avoid undefined behavior on time_t overflow.
    Reported by Elliott Hughes in
    <http://mm.icann.org/pipermail/tz/2013-August/019580.html>.

Bug: 10310929

(cherry picked from commit 713fe6463e)

Change-Id: I9ec79fd8d825e6b9e8bb5af549dbfc2182346c05

libc/tzcode/localtime.c

@@ -1812,14 +1812,14 @@ time2sub(struct tm * const tmp,
         } else  dir = tmcomp(&mytm, &yourtm);
         if (dir != 0) {
             if (t == lo) {
-                ++t;
-                if (t <= lo)
+                if (t == time_t_max)
                     return WRONG;
+                ++t;
                 ++lo;
             } else if (t == hi) {
-                --t;
-                if (t >= hi)
+                if (t == time_t_min)
                     return WRONG;
+                --t;
                 --hi;
             }
             if (lo > hi)