lo-commit-stat: really print the piece title into the log file

perl is really funny; the file handle can't be delimited by a comma

Change-Id: I49661d784ec3a10134e448800a3b81343e6748b1

bin/lo-commit-stat

@@ -243,7 +243,7 @@ sub print_summary_in_stat($$$$$$)
 
     # print piece title if not done yet
     if ( defined ${$ppiece_title} ) {
-        print $log, "${$ppiece_title}\n";
+        print $log "${$ppiece_title}\n";
         ${$ppiece_title} = undef;
     }