diff --git a/ui/vnc-tls.c b/ui/vnc-tls.c
index 50275de64f..63923265fd 100644
--- a/ui/vnc-tls.c
+++ b/ui/vnc-tls.c
@@ -443,10 +443,8 @@ static int vnc_set_x509_credential(VncDisplay *vd,
 {
     struct stat sb;
 
-    if (*cred) {
-        g_free(*cred);
-        *cred = NULL;
-    }
+    g_free(*cred);
+    *cred = NULL;
 
     *cred = g_malloc(strlen(certdir) + strlen(filename) + 2);
 
diff --git a/ui/vnc.c b/ui/vnc.c
index 1684206184..aac93f0e17 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -935,6 +935,9 @@ static int vnc_update_client(VncState *vs, int has_dirty, bool sync)
         }
 
         vnc_job_push(job);
+        if (sync) {
+            vnc_jobs_join(vs);
+        }
         vs->force_update = 0;
         return n;
     }
@@ -2972,10 +2975,8 @@ static void vnc_display_close(DisplayState *ds)
 
     if (!vs)
         return;
-    if (vs->display) {
-        g_free(vs->display);
-        vs->display = NULL;
-    }
+    g_free(vs->display);
+    vs->display = NULL;
     if (vs->lsock != -1) {
         qemu_set_fd_handler2(vs->lsock, NULL, NULL, NULL, NULL);
         close(vs->lsock);
@@ -3010,13 +3011,8 @@ int vnc_display_password(DisplayState *ds, const char *password)
         return -EINVAL;
     }
 
-    if (vs->password) {
-        g_free(vs->password);
-        vs->password = NULL;
-    }
-    if (password) {
-        vs->password = g_strdup(password);
-    }
+    g_free(vs->password);
+    vs->password = g_strdup(password);
 
     return 0;
 }