9p: convert to advancing variant of iov_iter_get_pages_alloc()
that one is somewhat clumsier than usual and needs serious testing.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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that one is somewhat clumsier than usual and needs serious testing.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>