sunxi: fix sxipio func mask

[Patrick Wildt]

Hi,

in sxipio the mask is incorrect for get- and setcfg.

If bit is 1, off is (1 & 7) << 2, which is 4. That means each cfg is 4
bits wide, so the mask is 0xf and not 0x7.  I cross-checked it with
NetBSD and Linux.

As far as I know it does not fix any known issue for me, it's just
something that caught my eye.

Patrick

diff --git sys/arch/armv7/sunxi/sxipio.c sys/arch/armv7/sunxi/sxipio.c
index 9a49343..07a3c76 100644
--- sys/arch/armv7/sunxi/sxipio.c
+++ sys/arch/armv7/sunxi/sxipio.c
@@ -249,7 +249,7 @@ sxipio_getcfg(int pin)
 
        splx(s);
 
-       return data >> off & 7;
+       return (data >> off) & 0xf;
 }
 
 void
@@ -263,7 +263,7 @@ sxipio_setcfg(int pin, int mux)
        bit = pin - (port << 5);
        reg = SXIPIO_CFG(port, bit >> 3);
        off = (bit & 7) << 2;
-       cmask = 7 << off;
+       cmask = 0xf << off;
        mask = mux << off;
 
        s = splhigh();