[SPARC64]: bp->pil can never be zero

Only pil0_dummy_bucket had a pil of zero and we just killed that
off, so we can delete all special case code that used bp->pil==0
as a way to identify a dummy bucket.
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/kernel/irq.c

@@ -633,7 +633,7 @@ static void process_bucket(struct ino_bucket *bp, struct pt_regs *regs)
 		if (!action_mask)
 			break;
 	}
-	if (bp->pil != 0) {
+
 	if (tlb_type == hypervisor) {
 		unsigned int ino = __irq_ino(bp);
 		int err;
@@ -649,7 +649,6 @@ static void process_bucket(struct ino_bucket *bp, struct pt_regs *regs)
 	/* Test and add entropy */
 	if (random & SA_SAMPLE_RANDOM)
 		add_interrupt_randomness(bp->pil);
-	}
 out:
 	bp->flags &= ~IBF_INPROGRESS;
 }