cifs: fix misspelling of "forcedirectio"

...and add a "directio" synonym since that's what the manpage has
always advertised.
Acked-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/connect.c

@@ -164,7 +164,8 @@ static const match_table_t cifs_mount_option_tokens = {
 	{ Opt_sign, "sign" },
 	{ Opt_seal, "seal" },
 	{ Opt_direct, "direct" },
-	{ Opt_direct, "forceddirectio" },
+	{ Opt_direct, "directio" },
+	{ Opt_direct, "forcedirectio" },
 	{ Opt_strictcache, "strictcache" },
 	{ Opt_noac, "noac" },
 	{ Opt_fsc, "fsc" },