silly little patch, but panic should be the exception, not the main
line of the code.

Reference: /n/atom/patch/applied2013/archhzclean
Date: Fri Aug 23 14:37:58 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/k10/archk10.c	Fri Aug 23 14:37:20 2013
+++ /sys/src/nix/k10/archk10.c	Fri Aug 23 14:37:20 2013
@@ -115,10 +115,10 @@
 
 	assert(m->machno == 0);
 	k10archinit();		/* botch; call from archinit */
-	if((hz = cpuidhz()) != 0)
-		return hz;
-	panic("hz 0");
-	return 0;
+	hz = cpuidhz();
+	if(hz == 0)
+		panic("hz 0");
+	return hz;
 }
 
 static void