__d_move(): fold manipulations with ->d_child/->d_subdirs
list_del() + list_add() is a slightly pessimised list_move()
list_del() + INIT_LIST_HEAD() is a slightly pessimised list_del_init()
Interleaving those makes the resulting code even worse. And harder to follow...
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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