amdkfd: Use the canonical form in branch predicates

Found-By: Coccinelle
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
index b6e28dc..a6a4b2b 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
@@ -177,9 +177,9 @@
 	bool ret;
 
 	ret = allocate_free_slot(p, page, signal_slot_index);
-	if (ret == false) {
+	if (!ret) {
 		ret = allocate_signal_page(devkfd, p);
-		if (ret == true)
+		if (ret)
 			ret = allocate_free_slot(p, page, signal_slot_index);
 	}