[Fix](compile) Fix BE compile failure (apache#60113)

introduced by apache#60042

Author: zclllyybb

be/src/vec/data_types/serde/data_type_timestamptz_serde.cpp

@@ -223,9 +223,7 @@ Status DataTypeTimeStampTzSerDe::write_column_to_orc(const std::string& timezone
         }
 
         int64_t timestamp = 0;
-        if (!col_data[row_id].unix_timestamp(&timestamp, UTC)) {
-            return Status::InternalError("get unix timestamp error.");
-        }
+        col_data[row_id].unix_timestamp(&timestamp, UTC);
 
         cur_batch->data[row_id] = timestamp;
         cur_batch->nanoseconds[row_id] = col_data[row_id].microsecond() * micro_to_nano_second;

be/src/vec/runtime/timestamptz_value.h

@@ -139,8 +139,8 @@ class TimestampTzValue {
 
     void set_microsecond(uint64_t microsecond) { _utc_dt.set_microsecond(microsecond); }
 
-    bool unix_timestamp(int64_t* timestamp, const cctz::time_zone& ctz) const {
-        return _utc_dt.unix_timestamp(timestamp, ctz);
+    void unix_timestamp(int64_t* timestamp, const cctz::time_zone& ctz) const {
+        _utc_dt.unix_timestamp(timestamp, ctz);
     }
 
     // Convert UTC time to local time based on the given timezone