igmp: fix incorrect unsolicit report count when join group
We should not start timer if im->unsolicit_count equal to 0 after decrease. Or we will send one more unsolicit report message. i.e. 3 instead of 2 by default. Fixes: 1da177e4 ("Linux-2.6.12-rc2") Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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