ext*: spelling fix prefered -> preferred

Spelling fix: prefered -> preferred

Signed-off-by: Benoit Boissinot <benoit.boissinot@ens-lyon.org>
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 8036b9b..486e46a 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -305,7 +305,7 @@
  * it has too few free inodes left (min_inodes) or
  * it has too few free blocks left (min_blocks) or
  * it's already running too large debt (max_debt).
- * Parent's group is prefered, if it doesn't satisfy these
+ * Parent's group is preferred, if it doesn't satisfy these
  * conditions we search cyclically through the rest. If none
  * of the groups look good we just look for a group with more
  * free inodes than average (starting at parent's group).