[source] imx6: fix image boot ubifs compression option

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/1c6b1ab01dd6a5aa05e1b6d5f41c16b813288dd5

commit 1c6b1ab01dd6a5aa05e1b6d5f41c16b813288dd5
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon Jan 9 16:29:16 2017 +0100

    imx6: fix image boot ubifs compression option
    
    --force-compr was added by the xz compression patch, which is gone now.
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 target/linux/imx6/image/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/imx6/image/Makefile b/target/linux/imx6/image/Makefile
index 3ff1d36..2c17058 100644
--- a/target/linux/imx6/image/Makefile
+++ b/target/linux/imx6/image/Makefile
@@ -34,7 +34,7 @@ define Build/boot-overlay
 		$@.boot/6x_bootscript-$(DEVICE_NAME)
 
 	$(STAGING_DIR_HOST)/bin/mkfs.ubifs \
-		--space-fixup --force-compr=zlib --squash-uids \
+		--space-fixup --compr=zlib --squash-uids \
 		$(MKUBIFS_OPTS) -c 8124 \
 		-o $@.boot.ubifs -d $@.boot