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pc, pc64: remove "got unassigned irq" prints

most pc's are multiprocessors these days, that use apic or
msi interrupts, then the irq does not matter anymore. and
uefi does not even assign irq to pci devices anymore. if
we have a problem enabling an interrupt, we will print.

--- a/sys/src/9/pc/trap.c

+++ b/sys/src/9/pc/trap.c

@@ -40,11 +40,8 @@

 			irq, tbdf, name);

 		return;

 	}

-	if(tbdf != BUSUNKNOWN && (irq == 0xff || irq == 0)){

-		print("intrenable: got unassigned irq %d, tbdf 0x%uX for %s\n",

-			irq, tbdf, name);

+	if(tbdf != BUSUNKNOWN && (irq == 0xff || irq == 0))

 		irq = -1;

-	}

 	/*

 	 * IRQ2 doesn't really exist, it's used to gang the interrupt

--- a/sys/src/9/pc64/trap.c

+++ b/sys/src/9/pc64/trap.c

@@ -41,11 +41,8 @@

 		return;

 	}

-	if(tbdf != BUSUNKNOWN && (irq == 0xff || irq == 0)){

-		print("intrenable: got unassigned irq %d, tbdf 0x%uX for %s\n",

-			irq, tbdf, name);

+	if(tbdf != BUSUNKNOWN && (irq == 0xff || irq == 0))

 		irq = -1;

-	}

 	/*