Staging: hv: fix oops in vmbus - netvsc list_head

Remove incorrect list_head usage. Variable of type list_head was used in
some function's arguments as list item.

Signed-off-by: Milan Dadok <milan@dadok.name>
Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>