[openwrt/openwrt] ipq806x: unset filesystem specific build command by default

[LEDE Commits]

mkresin pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/52e7df3f49d627270046f5ea73d696a1855e4609

commit 52e7df3f49d627270046f5ea73d696a1855e4609
Author: Mathias Kresin <dev at kresin.me>
AuthorDate: Sun Jan 14 21:39:42 2018 +0100

    ipq806x: unset filesystem specific build command by default
    
    Initialise the filesystem specific build command. Otherwise it will be
    unintended inherit to following images and will cause a wrong image
    format.
    
    The issue is around for ages but was only recently triggered due to the
    added support for the Openmesh a42.
    
    Fixes: FS#1276
    
    Signed-off-by: Mathias Kresin <dev at kresin.me>
---
 target/linux/ipq806x/image/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/ipq806x/image/Makefile b/target/linux/ipq806x/image/Makefile
index fd562b9..bc2e1a4 100644
--- a/target/linux/ipq806x/image/Makefile
+++ b/target/linux/ipq806x/image/Makefile
@@ -31,6 +31,7 @@ define Device/Default
 	KERNEL_LOADADDR = 0x42208000
 	SUPPORTED_DEVICES := $(subst _,$(comma),$(1))
 	IMAGE/sysupgrade.bin = sysupgrade-tar | append-metadata
+	IMAGE/sysupgrade.bin/squashfs :=
 endef
 
 define Device/LegacyImage