md/raid5: Remove stripe_head_state arg from handle_stripe_expansion.

This arg is only used to differentiate between RAID5 and RAID6 but
that is not needed.  For RAID5, raid5_compute_sector will set qd_idx
to "~0" so j with certainly not equals qd_idx, so there is no need
for a guard on that condition.

So remove the guard and remove the arg from the declaration and
callers of handle_stripe_expansion.
Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>

drivers/md/raid5.c

@@ -2921,8 +2921,7 @@ static void handle_parity_checks6(raid5_conf_t *conf, struct stripe_head *sh,
 	}
 }
 
-static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh,
-				    struct stripe_head_state *r6s)
+static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh)
 {
 	int i;
 
@@ -2964,7 +2963,7 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh,
 			set_bit(R5_UPTODATE, &sh2->dev[dd_idx].flags);
 			for (j = 0; j < conf->raid_disks; j++)
 				if (j != sh2->pd_idx &&
-				    (!r6s || j != sh2->qd_idx) &&
+				    j != sh2->qd_idx &&
 				    !test_bit(R5_Expanded, &sh2->dev[j].flags))
 					break;
 			if (j == conf->raid_disks) {
@@ -3249,7 +3248,7 @@ static void handle_stripe5(struct stripe_head *sh, struct stripe_head_state *s)
 
 	if (s->expanding && s->locked == 0 &&
 	    !test_bit(STRIPE_COMPUTE_RUN, &sh->state))
-		handle_stripe_expansion(conf, sh, NULL);
+		handle_stripe_expansion(conf, sh);
 }
 
 static void handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s)
@@ -3512,7 +3511,7 @@ static void handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s)
 
 	if (s->expanding && s->locked == 0 &&
 	    !test_bit(STRIPE_COMPUTE_RUN, &sh->state))
-		handle_stripe_expansion(conf, sh, s);
+		handle_stripe_expansion(conf, sh);
 }
 
 static void handle_stripe(struct stripe_head *sh)