ext4: Remove an old reference to ext4dev in Makefile comment

From: Martin Michlmayr <tbm@cyrius.com>

Remove an old reference to ext4dev.

Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/Makefile b/fs/Makefile
index de404b0..1f6f9f5 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -69,7 +69,7 @@ obj-$(CONFIG_DLM)		+= dlm/
 # Do not add any filesystems before this line
 obj-$(CONFIG_REISERFS_FS)	+= reiserfs/
 obj-$(CONFIG_EXT3_FS)		+= ext3/ # Before ext2 so root fs can be ext3
-obj-$(CONFIG_EXT4_FS)		+= ext4/ # Before ext2 so root fs can be ext4dev
+obj-$(CONFIG_EXT4_FS)		+= ext4/ # Before ext2 so root fs can be ext4
 obj-$(CONFIG_JBD)		+= jbd/
 obj-$(CONFIG_JBD2)		+= jbd2/
 obj-$(CONFIG_EXT2_FS)		+= ext2/