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nusb/ether: fix pointer truncation

--- a/sys/src/cmd/nusb/ether/ether.c

+++ b/sys/src/cmd/nusb/ether/ether.c

@@ -91,7 +91,7 @@

 #define PATH(type, n)		((type)|((n)<<8))

 #define TYPE(path)			(((uint)(path) & 0x000000FF)>>0)

 #define NUM(path)			(((uint)(path) & 0xFFFFFF00)>>8)

-#define NUMCONN(c)		(((long)(c)-(long)&conn[0])/sizeof(conn[0]))

+#define NUMCONN(c)		(((uintptr)(c)-(uintptr)&conn[0])/sizeof(conn[0]))

 static void

 fillstat(Dir *d, uvlong path)