btrfs: fill ncopies for all raid table entries

Make the number of copies explicit even for entries that use the default
0 value for consistency.
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/volumes.c

@@ -66,6 +66,7 @@ const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
 		.tolerated_failures = 2,
 		.devs_increment	= 3,
 		.ncopies	= 3,
+		.nparity        = 0,
 		.raid_name	= "raid1c3",
 		.bg_flag	= BTRFS_BLOCK_GROUP_RAID1C3,
 		.mindev_error	= BTRFS_ERROR_DEV_RAID1C3_MIN_NOT_MET,
@@ -78,6 +79,7 @@ const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
 		.tolerated_failures = 3,
 		.devs_increment	= 4,
 		.ncopies	= 4,
+		.nparity        = 0,
 		.raid_name	= "raid1c4",
 		.bg_flag	= BTRFS_BLOCK_GROUP_RAID1C4,
 		.mindev_error	= BTRFS_ERROR_DEV_RAID1C4_MIN_NOT_MET,