ext4: Fix comment typo "especiially".

Change "especiially" to "especially".

Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index c4068f6..6b90b68 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -131,7 +131,7 @@
 		 * fragmenting the file system's free space.  Maybe we
 		 * should have some hueristics or some way to allow
 		 * userspace to pass a hint to file system,
-		 * especiially if the latter case turns out to be
+		 * especially if the latter case turns out to be
 		 * common.
 		 */
 		ex = path[depth].p_ext;