ar71xx: fix typo in platform_do_upgrade_compex()

Fixes: a71742882855 ("treewide: use new procd sysupgrade $UPGRADE_BACKUP variable")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 63d611390c4d34a838e744e278529f30f9d2cc20)

diff --git a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
index b24467f87969f99c010d41205326d300bf431d85..f211ce7156983582b214e7fd4eaf838809961a83 100755 (executable)
--- a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
@@ -164,7 +164,7 @@ platform_do_upgrade_compex() {
 
        if [ -n "$fw_mtd" ] &&  [ ${fw_blocks:-0} -gt 0 ]; then
                local append=""
-               [ -f "$UPGRADE_BACKUP" ] && append="-j $UPGRADE_BACKUPs"
+               [ -f "$UPGRADE_BACKUP" ] && append="-j $UPGRADE_BACKUP"
 
                sync
                dd if="$fw_file" bs=64k skip=1 count=$fw_blocks 2>/dev/null | \