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H A Diov_iter.ce3b42964 Sat Jun 11 01:52:03 CDT 2022 Al Viro <viro@zeniv.linux.org.uk> ITER_PIPE: fold push_pipe() into __pipe_get_pages()

Expand the only remaining call of push_pipe() (in
__pipe_get_pages()), combine it with the page-collecting loop there.

Note that the only reason it's not a loop doing append_pipe() is
that append_pipe() is advancing, while iov_iter_get_pages() is not.
As soon as it switches to saner semantics, this thing will switch
to using append_pipe().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>