9p: embed fcall in req to round down buffer allocs

'msize' is often a power of two, or at least page-aligned, so avoiding
an overhead of two dozen bytes for each allocation will help the
allocator do its work and reduce memory fragmentation.

Link: http://lkml.kernel.org/r/[email protected]
Suggested-by: Matthew Wilcox <[email protected]>
Signed-off-by: Dominique Martinet <[email protected]>
Reviewed-by: Greg Kurz <[email protected]>
Acked-by: Jun Piao <[email protected]>
Cc: Matthew Wilcox <[email protected]>

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