Revert "net: igmp: fix data-race in igmp_ifc_timer_expire()"

This reverts commit fb5db310 which is
commit 4a2b285e upstream.

It breaks the kernel abi (well the fix for this fix does), and is not
needed for Android devices.

Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I1c59c60493d216f1671b110a948f38293a0925ee