Clean comments up, merge ext2 inode block index code

include/sys/chr.h

@@ -4,7 +4,6 @@
 struct chrdev {
     void *dev_data;
 
-    // TODO: maybe something like flush()
     ssize_t (*write) (struct chrdev *chr, const void *buf, size_t pos, size_t lim);
     ssize_t (*read) (struct chrdev *chr, void *buf, size_t pos, size_t lim);
 };

include/sys/dev.h

@@ -3,9 +3,6 @@
 
 struct vnode;
 
-// TODO: something like device name alias
-//       for example, /dev/root aliased to
-//       /dev/ramN or /dev/sdXN
 enum dev_class {
     DEV_CLASS_BLOCK = 1,
     DEV_CLASS_CHAR = 2,