[IA64] fix IO_SPACE_SPARSE_ENCODING macro ambiguity
Parenthesize "p" to avoid ambiguity. No callers have a problem today; this is just to clean up the bad form. Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: NTony Luck <tony.luck@intel.com>
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