Fix a panic when leaving MC group in a kernel with VIMAGE enabled. in_leavegroup() is called from an asynchronous task, and igmp_change_state() requires that curvnet is set by the caller.
Fix a panic when leaving MC group in a kernel with VIMAGE enabled.
in_leavegroup() is called from an asynchronous task, and
igmp_change_state() requires that curvnet is set by the caller.

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