[source] uqmi: fix option ipv6

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=15867deac8c9fd571e01532db03db08b515a3b42

commit 15867deac8c9fd571e01532db03db08b515a3b42
Author: Florian Eckert <Eckert.Florian at googlemail.com>
AuthorDate: Fri Jul 22 11:33:08 2016 +0200

    uqmi: fix option ipv6
    
    If option ist not set then ipv6 is still enabled on this Interface.
    Check if variable is zero will fix this issue.
    
    Signed-off-by: Florian Eckert <Eckert.Florian at googlemail.com>
---
 package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh b/package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh
index 48864be..6dcc226 100755
--- a/package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh
+++ b/package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh
@@ -31,11 +31,7 @@ proto_qmi_setup() {
 
 	ipv4=1
 
-	if [ "$ipv6" = 0 ]; then
-		ipv6=""
-	else
-		ipv6=1
-	fi
+	[ "$ipv6" = 1 ] || ipv6=""
 
 	[ -n "$ctl_device" ] && device=$ctl_device