cpuid should return void, since we're not checking the return value.
(there isn't a unique return value anyway.)

Reference: /n/atom/patch/applied2013/nixvoidcpuid
Date: Tue Sep 17 00:46:16 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/archk10.c	Tue Sep 17 00:45:49 2013
+++ /sys/src/nix/k10/archk10.c	Tue Sep 17 00:45:51 2013
@@ -144,7 +144,8 @@
 	/*
 	 * Check the Page1GB bit in function 0x80000001 DX for 1*GiB support.
 	 */
-	if(cpuid(0x80000001, 0, info) && (info[3] & 0x04000000))
+	cpuid(0x80000001, 0, info);
+	if(info[3] & 0x04000000)
 		addmachpgsz(30);
 	return m->npgsz;
 }
--- /sys/src/nix/k10/fns.h	Tue Sep 17 00:45:53 2013
+++ /sys/src/nix/k10/fns.h	Tue Sep 17 00:45:54 2013
@@ -16,7 +16,7 @@
 #define	clearmmucache()				/* x86 doesn't have one */
 #define coherence()	mfence()
 void	confsetenv(void);
-u32int	cpuid(u32int, u32int, u32int[4]);
+void	cpuid(u32int, u32int, u32int[4]);
 int	dbgprint(char*, ...);
 void	delay(int);
 int	devacpiinit(void);