powerpc: remove unnecessary unlikely()

WARN_ON() already contains an unlikely(), so it's not necessary to
wrap it into another.

Signed-off-by: Igor Stoppa <igor.stoppa@huawei.com>
Cc: Arseny Solokha <asolokha@kb.kras.ru>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/mm/tlb_nohash.c

@@ -302,7 +302,7 @@ void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
 	 * This function as well as __local_flush_tlb_page() must only be called
 	 * for user contexts.
 	 */
-	if (unlikely(WARN_ON(!mm)))
+	if (WARN_ON(!mm))
 		return;
 
 	preempt_disable();

arch/powerpc/sysdev/xive/common.c

@@ -442,7 +442,7 @@ static void xive_dec_target_count(int cpu)
 	struct xive_cpu *xc = per_cpu(xive_cpu, cpu);
 	struct xive_q *q = &xc->queue[xive_irq_priority];
 
-	if (unlikely(WARN_ON(cpu < 0 || !xc))) {
+	if (WARN_ON(cpu < 0 || !xc)) {
 		pr_err("%s: cpu=%d xc=%p\n", __func__, cpu, xc);
 		return;
 	}