[syslog] fix syslog timestamps

src/log_format.hh

@@ -484,6 +484,8 @@ public:
         std::auto_ptr<log_format> retval((log_format *)
                                          new external_log_format(*this));
 
+        retval->lf_base_time = this->lf_base_time;
+
         return retval;
     };
 

src/logfile.cc

@@ -134,11 +134,11 @@ void logfile::process_prefix(off_t offset, char *prefix, int len)
         for (iter = root_formats.begin();
              iter != root_formats.end() && !found;
              ++iter) {
+            (*iter)->clear();
             (*iter)->lf_base_time = this->lf_line_buffer.get_file_time();
             if ((*iter)->lf_base_time == 0) {
                 (*iter)->lf_base_time = this->lf_stat.st_mtime;
             }
-            (*iter)->clear();
             if ((*iter)->scan(this->lf_index, offset, prefix, len)) {
 #if 0
                 assert(this->lf_index.size() == 1 ||