Revert "blktrace: use for_each_file() instead of open coding the loop"

There's another bug in where we don't have the number of
files in replay mode correctly stored in td->o.nr_files. So
revert this until that bug is fixed as well.

This reverts commit adfc73488616bac66f910d53c75202d5be8afe87.
diff --git a/blktrace.c b/blktrace.c
index dea1be4..e195f7f 100644
--- a/blktrace.c
+++ b/blktrace.c
@@ -418,8 +418,10 @@
 		}
 	} while (1);
 
-	for_each_file(td, f, i)
+	for (i = 0; i < td->files_index; i++) {
+		f= td->files[i];
 		trace_add_open_close_event(td, f->fileno, FIO_LOG_CLOSE_FILE);
+	}
 
 	fifo_free(fifo);
 	close(fd);