fixed time_format printing (BUG#7521)

mysql-test/r/view.result:
  using time_format in view (BUG#7521)
mysql-test/t/view.test:
  using time_format in view (BUG#7521)
sql/item_timefunc.h:
  fixed func_name reportion

mysql-test/r/view.result

@@ -1743,3 +1743,8 @@ select * from v1;
 cast(1 as decimal)
 1.00
 drop view v1;
+create view v1 as SELECT TIME_FORMAT(SEC_TO_TIME(3600),'%H:%i') as t;
+select * from v1;
+t
+01:00
+drop view v1;

mysql-test/t/view.test

@@ -1587,3 +1587,10 @@ drop table t1;
 create view v1 as select cast(1 as decimal);
 select * from v1;
 drop view v1;
+
+#
+# using time_format in view (BUG#7521)
+#
+create view v1 as SELECT TIME_FORMAT(SEC_TO_TIME(3600),'%H:%i') as t;
+select * from v1;
+drop view v1;

sql/item_timefunc.h

@@ -503,7 +503,8 @@ public:
   Item_func_date_format(Item *a,Item *b,bool is_time_format_arg)
     :Item_str_func(a,b),is_time_format(is_time_format_arg) {}
   String *val_str(String *str);
-  const char *func_name() const { return "date_format"; }
+  const char *func_name() const
+    { return is_time_format ? "time_format" : "date_format"; }
   void fix_length_and_dec();
   uint format_length(const String *format);
 };