sec_to_time() in the integer context was losing the sign of the result

mysql-test/r/func_time.result

@@ -27,6 +27,10 @@ sec_to_time('9001.1')	sec_to_time('1234567890123.123')
 02:30:01.100000	838:59:59.999999
 Warnings:
 Warning	1292	Truncated incorrect time value: '1234567890123.123'
+select sec_to_time(-9001.1), sec_to_time(-9001.1) / 1,
+sec_to_time(-9001.1) / 1e0, sec_to_time(-9001) div 1;
+sec_to_time(-9001.1)	sec_to_time(-9001.1) / 1	sec_to_time(-9001.1) / 1e0	sec_to_time(-9001) div 1
+-02:30:01.1	-23001.10000	-23001.1	-23001
 select sec_to_time(90011e-1), sec_to_time(1234567890123e30);
 sec_to_time(90011e-1)	sec_to_time(1234567890123e30)
 02:30:01.100000	838:59:59.999999

mysql-test/t/func_time.test

@@ -18,6 +18,8 @@ select sec_to_time(9001),sec_to_time(9001)+0,time_to_sec("15:12:22"),
 select sec_to_time(9001.1), time_to_sec('15:12:22.123456'), time_to_sec(15.5566778899);
 select sec_to_time(time_to_sec('-838:59:59'));
 select sec_to_time('9001.1'), sec_to_time('1234567890123.123');
+select sec_to_time(-9001.1), sec_to_time(-9001.1) / 1,
+       sec_to_time(-9001.1) / 1e0, sec_to_time(-9001) div 1;
 --replace_result e+042 e+42
 select sec_to_time(90011e-1), sec_to_time(1234567890123e30);
 select sec_to_time(1234567890123), sec_to_time('99999999999999999999999999999');

sql/item_timefunc.cc

@@ -1370,7 +1370,8 @@ longlong Item_temporal_func::val_int()
   MYSQL_TIME ltime;
   if (get_date(&ltime, TIME_FUZZY_DATE))
     return 0;
-  return (longlong)TIME_to_ulonglong(&ltime);
+  longlong v= TIME_to_ulonglong(&ltime);
+  return ltime.neg ? -v : v;
 }