btrfs-progs: bump to version 4.8.1

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/btrfs-progs/btrfs-progs.hash

@@ -1,2 +1,2 @@
 # From https://www.kernel.org/pub/linux/kernel/people/kdave/btrfs-progs/sha256sums.asc
-sha256	90cd6f0ce5a8bed5fcd6ea8a70d81de4a038163035d48a9ae0339bbf51df771c	btrfs-progs-v4.7.3.tar.xz
+sha256	836e6d707abfc155319c072f53d296261cbd17f0e03484a3694b8af48640db83	btrfs-progs-v4.8.1.tar.xz

package/btrfs-progs/btrfs-progs.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-BTRFS_PROGS_VERSION = 4.7.3
+BTRFS_PROGS_VERSION = 4.8.1
 BTRFS_PROGS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/people/kdave/btrfs-progs
 BTRFS_PROGS_SOURCE = btrfs-progs-v$(BTRFS_PROGS_VERSION).tar.xz
 BTRFS_PROGS_DEPENDENCIES = host-pkgconf e2fsprogs lzo util-linux zlib