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power64: refactor va_arg in u.h to fix warnings

Bring over conventions from other archs.
This issue shows up when you don't put va_end,
which our systemcall handlers are guilty of.

--- a/power64/include/u.h

+++ b/power64/include/u.h

@@ -84,9 +84,9 @@

 	USED(list)

 #define va_arg(list, mode)\

 	((sizeof(mode) == 1)?\

-		((mode*)(list += 8))[-1]:\

+		((list += 8), (mode*)list)[-1]:\

 	(sizeof(mode) == 2)?\

-		((mode*)(list += 8))[-1]:\

+		((list += 8), (mode*)list)[-1]:\

 	(sizeof(mode) == 4)?\

-		((mode*)(list += 8))[-1]:\

-		((mode*)(list += sizeof(mode)))[-1])

+		((list += 8), (mode*)list)[-1]:\

+		((list += sizeof(mode)), (mode*)list)[-1])