ext4: Report max_batch_time option correctly

Currently the value reported for max_batch_time is really the
value of min_batch_time.

Reported-by: Russell Coker <russell@coker.com.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 35377d5..36570b7 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1096,7 +1096,7 @@
 	}
 	if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
 		seq_printf(seq, ",max_batch_time=%u",
-			   (unsigned) sbi->s_min_batch_time);
+			   (unsigned) sbi->s_max_batch_time);
 	}
 
 	/*