accel/kvm: Make kvm_dirty_ring_reaper_init() void

The returned value was always zero and had no meaning.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-id: 20230727073134.134102-7-akihiko.odaki@daynix.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

accel/kvm/kvm-all.c

@@ -1454,15 +1454,13 @@ static void *kvm_dirty_ring_reaper_thread(void *data)
     return NULL;
 }
 
-static int kvm_dirty_ring_reaper_init(KVMState *s)
+static void kvm_dirty_ring_reaper_init(KVMState *s)
 {
     struct KVMDirtyRingReaper *r = &s->reaper;
 
     qemu_thread_create(&r->reaper_thr, "kvm-reaper",
                        kvm_dirty_ring_reaper_thread,
                        s, QEMU_THREAD_JOINABLE);
-
-    return 0;
 }
 
 static int kvm_dirty_ring_init(KVMState *s)
@@ -2744,10 +2742,7 @@ static int kvm_init(MachineState *ms)
     }
 
     if (s->kvm_dirty_ring_size) {
-        ret = kvm_dirty_ring_reaper_init(s);
-        if (ret) {
-            goto err;
-        }
+        kvm_dirty_ring_reaper_init(s);
     }
 
     if (kvm_check_extension(kvm_state, KVM_CAP_BINARY_STATS_FD)) {