igmpproxy: fix init script indentation

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43658 3c298f89-4303-0410-b956-a3cf2f4a3e73
igmpproxy: do not start instance if no upstream interface is available

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43659 3c298f89-4303-0410-b956-a3cf2f4a3e73
igmpproxy: do not attempt to ifstatus error messages as json

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43660 3c298f89-4303-0410-b956-a3cf2f4a3e73