autofs: drop wrong comment

This comment was correct when it was added in 8d7b48e0 ("autofs4: add
miscellaneous device for ioctls") in 2008, but not after 4e44b685 "Get rid
of path_lookup in autofs4" in 2009 which introduced find_autofs_mount().

Link: http://lkml.kernel.org/r/150285069148.4670.17959501481201077445.stgit@pluto.themaw.net
Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/autofs4/dev-ioctl.c

@@ -258,11 +258,6 @@ static int autofs_dev_ioctl_open_mountpoint(const char *name, dev_t devid)
 		if (err)
 			goto out;
 
-		/*
-		 * Find autofs super block that has the device number
-		 * corresponding to the autofs fs we want to open.
-		 */
-
 		filp = dentry_open(&path, O_RDONLY, current_cred());
 		path_put(&path);
 		if (IS_ERR(filp)) {