md: Fix a typo in the comment to cmd_match().

Signed-off-by: NAndre Noll <maan@systemlinux.org>
Signed-off-by: NNeil Brown <neilb@suse.de>

drivers/md/md.c

@@ -1849,7 +1849,7 @@ static void md_update_sb(mddev_t * mddev, int force_change)
 
 }
 
-/* words written to sysfs files may, or my not, be \n terminated.
+/* words written to sysfs files may, or may not, be \n terminated.
  * We want to accept with case. For this we use cmd_match.
  */
 static int cmd_match(const char *cmd, const char *str)