[PATCH] Must use ->real_file_size

->file_size is the size of the file from offset, while ->real_file_size
is the total size of the file. So when comparing EOF, we should look
at ->real_file_size against the offset.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/filesetup.c b/filesetup.c
index cc89b7e..a14cd95 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -156,7 +156,7 @@
 			f->file_size = f->real_file_size;
 	}
 
-	f->file_size -= f->file_offset;
+	f->file_size = f->real_file_size - f->file_offset;
 	return 0;
 }