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7a: fix post increment operands

--- a/sys/src/cmd/7a/a.y

+++ b/sys/src/cmd/7a/a.y

@@ -542,8 +542,10 @@

 	}

 |	'(' sreg ')' con '!'

 	{

+		$$ = nullgen;

 		$$.type = D_XPOST;

-		$$.offset = $2;

+		$$.reg = $2;

+		$$.offset = $4;

 	}

 |	'(' sreg ')' '(' indexreg ')'

 	{

-- 

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