add missing parens around `x' in g8byte body.

Reference: /n/sources/patch/applied/tapefs-g8byte-parens
Date: Sun Feb 26 03:35:27 CET 2006

--- /sys/src/cmd/tapefs/tapefs.h	Sun Feb 26 03:35:18 2006
+++ /sys/src/cmd/tapefs/tapefs.h	Sun Feb 26 03:35:16 2006
@@ -1,7 +1,7 @@
 #define	g2byte(x)	(((x)[1]<<8) + (x)[0])		/* little-endian */
 #define	g3byte(x)	(((x)[2]<<16) + ((x)[1]<<8) + (x)[0])
 #define	g4byte(x)	(((x)[3]<<24) + ((x)[2]<<16) + ((x)[1]<<8) + (x)[0])
-#define	g8byte(x)	(((vlong)g4byte(x)<<32) | (u32int)g4byte(x+4))
+#define	g8byte(x)	(((vlong)g4byte(x)<<32) | (u32int)g4byte((x)+4))
 enum
 {
 	OPERM	= 0x3,		/* mask of all permission types in open mode */