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disk/qcowfs: correct GET2 off by one

--- a/sys/src/cmd/disk/qcowfs.c

+++ b/sys/src/cmd/disk/qcowfs.c

@@ -74,7 +74,7 @@

 };

 #define PUT2(p, u) (p)[0] = (u)>>8, (p)[1] = (u)

-#define GET2(p) (u16int)(p)[2] | (u16int)(p)[1]<<8

+#define GET2(p) (u16int)(p)[1] | (u16int)(p)[0]<<8

 #define PUT4(p, u) (p)[0] = (u)>>24, (p)[1] = (u)>>16, (p)[2] = (u)>>8, (p)[3] = (u)

 #define GET4(p)	(u32int)(p)[3] | (u32int)(p)[2]<<8 | (u32int)(p)[1]<<16 | (u32int)(p)[0]<<24