Remove obsolete comment in fs.h

This question was determined to be a bug which was fixed in
commit 4a3b0a49.
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Cc: Jan Blunck <jblunck@suse.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

include/linux/fs.h

@@ -1624,8 +1624,6 @@ struct super_operations {
  *			on the bit address once it is done.
  *
  * Q: What is the difference between I_WILL_FREE and I_FREEING?
- * Q: igrab() only checks on (I_FREEING|I_WILL_FREE).  Should it also check on
- *    I_CLEAR?  If not, why?
  */
 #define I_DIRTY_SYNC		1
 #define I_DIRTY_DATASYNC	2