lockable: replaced locks with lock guard macros where appropriate

- ran regexp "qemu_mutex_lock\(.*\).*\n.*if" to find targets
- replaced result with QEMU_LOCK_GUARD if all unlocks at function end
- replaced result with WITH_QEMU_LOCK_GUARD if unlock not at end

Signed-off-by: Daniel Brodsky <dnbrdsky@gmail.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-id: 20200404042108.389635-3-dnbrdsky@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/util/qemu-timer.c b/util/qemu-timer.c
index d548d3c..b6575a2 100644
--- a/util/qemu-timer.c
+++ b/util/qemu-timer.c
@@ -459,17 +459,16 @@
     QEMUTimerList *timer_list = ts->timer_list;
     bool rearm;
 
-    qemu_mutex_lock(&timer_list->active_timers_lock);
-    if (ts->expire_time == -1 || ts->expire_time > expire_time) {
-        if (ts->expire_time != -1) {
-            timer_del_locked(timer_list, ts);
+    WITH_QEMU_LOCK_GUARD(&timer_list->active_timers_lock) {
+        if (ts->expire_time == -1 || ts->expire_time > expire_time) {
+            if (ts->expire_time != -1) {
+                timer_del_locked(timer_list, ts);
+            }
+            rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
+        } else {
+            rearm = false;
         }
-        rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
-    } else {
-        rearm = false;
     }
-    qemu_mutex_unlock(&timer_list->active_timers_lock);
-
     if (rearm) {
         timerlist_rearm(timer_list);
     }