softmmu/dirtylimit: Convert free to g_free

Convert free to g_free to match g_new and g_malloc functions.

Fixes: cc2b33ea ("softmmu/dirtylimit: Implement vCPU dirtyrate calculation periodically")
Fixes: baa60983 ("softmmu/dirtylimit: Implement virtual CPU throttle")
Signed-off-by: alloc.young <alloc.young@outlook.com>
Reviewed-by: Hyman Huang <yong.huang@smartx.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <SA1PR11MB67604ECD85AFF34BEB3072F7F5E3A@SA1PR11MB6760.namprd11.prod.outlook.com>
Signed-off-by: Hyman Huang <yong.huang@smartx.com>

softmmu/dirtylimit.c

@@ -100,7 +100,7 @@ static void vcpu_dirty_rate_stat_collect(void)
             stat.rates[i].dirty_rate;
     }
 
-    free(stat.rates);
+    g_free(stat.rates);
 }
 
 static void *vcpu_dirty_rate_stat_thread(void *opaque)
@@ -171,10 +171,10 @@ void vcpu_dirty_rate_stat_initialize(void)
 
 void vcpu_dirty_rate_stat_finalize(void)
 {
-    free(vcpu_dirty_rate_stat->stat.rates);
+    g_free(vcpu_dirty_rate_stat->stat.rates);
     vcpu_dirty_rate_stat->stat.rates = NULL;
 
-    free(vcpu_dirty_rate_stat);
+    g_free(vcpu_dirty_rate_stat);
     vcpu_dirty_rate_stat = NULL;
 }
 
@@ -220,10 +220,10 @@ void dirtylimit_state_initialize(void)
 
 void dirtylimit_state_finalize(void)
 {
-    free(dirtylimit_state->states);
+    g_free(dirtylimit_state->states);
     dirtylimit_state->states = NULL;
 
-    free(dirtylimit_state);
+    g_free(dirtylimit_state);
     dirtylimit_state = NULL;
 
     trace_dirtylimit_state_finalize();