[source] kirkwood: fix UBIFS_OPTS variable in image build

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=064bcdc25907e7c9c949bb80c4772ecf81178d66

commit 064bcdc25907e7c9c949bb80c4772ecf81178d66
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon Jul 25 12:30:13 2016 +0200

    kirkwood: fix UBIFS_OPTS variable in image build
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 target/linux/kirkwood/image/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/kirkwood/image/Makefile b/target/linux/kirkwood/image/Makefile
index 1b979b7..20c697e 100644
--- a/target/linux/kirkwood/image/Makefile
+++ b/target/linux/kirkwood/image/Makefile
@@ -15,7 +15,7 @@ KERNEL_LOADADDR:=0x8000
 TARGET_DEVICES = linksys-audi linksys-viper dockstar goflexnet goflexhome
 
 UBI_OPTS:="-m 2048 -p 128KiB -s 512"
-UBIFS_OPTS:="-m 2048 -e 126KiB -c 4096"
+UBIFS_OPTS := -m 2048 -e 126KiB -c 4096
 
 define Device/Default
   KERNEL_DEPENDS = $$(wildcard $(DTS_DIR)/$$(DEVICE_DTS).dts)