Make annoying "irqdisable:" messages conditional on Debug being set.

Reference: /n/sources/patch/applied/teg2-irqdisable-quiet
Date: Tue Mar 26 11:36:27 CET 2013
Signed-off-by: miller@hamnavoe.com

--- /sys/src/9/teg2/trap.c	Tue Mar 26 11:35:53 2013
+++ /sys/src/9/teg2/trap.c	Tue Mar 26 11:35:49 2013
@@ -573,7 +573,8 @@
 	lock(&vctllock);
 	for(vp = &vctl[irq]; v = *vp; vp = &v->next)
 		if (v->f == f && v->a == a && strcmp(v->name, name) == 0){
-			print("irqdisable: remove %s\n", name);
+			if(Debug)
+				print("irqdisable: remove %s\n", name);
 			*vp = v->next;
 			free(v->name);
 			free(v);
@@ -583,7 +584,8 @@
 	if(v == nil)
 		print("irqdisable: irq %d, name %s not enabled\n", irq, name);
 	if(vctl[irq] == nil){
-		print("irqdisable: clear icmr bit %d\n", irq);
+		if(Debug)
+			print("irqdisable: clear icmr bit %d\n", irq);
 		intcmask(irq);
 	}
 	unlock(&vctllock);