trivial: fs/btrfs/ioctl.c: fix typo s/substract/subtract/

Signed-off-by: Antonio Ospite <ao2@ao2.it>
Cc: Chris Mason <clm@fb.com>
Cc: Josef Bacik <jbacik@fb.com>
Cc: linux-btrfs@vger.kernel.org
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 44dcfd0..dd9a02a 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3216,11 +3216,11 @@ process_slot:
                                 * | ------------- extent ------------- |
                                 */
 
-                               /* substract range b */
+                               /* subtract range b */
                                if (key.offset + datal > off + len)
                                        datal = off + len - key.offset;
 
-                               /* substract range a */
+                               /* subtract range a */
                                if (off > key.offset) {
                                        datao += off - key.offset;
                                        datal -= off - key.offset;