qemu-error: make use of {error, warn}_report_once_cond

{error,warn}_report_once() are a special case of the new functions
and can simply switch to them.
Signed-off-by: NCornelia Huck <cohuck@redhat.com>
Message-Id: <20180830145902.27376-3-cohuck@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
[Dispense with unlikely() to keep the macros as simple as possible]
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>

include/qemu/error-report.h

@@ -53,32 +53,22 @@ bool warn_report_once_cond(bool *printed, const char *fmt, ...)
  * Similar to error_report(), except it prints the message just once.
  * Return true when it prints, false otherwise.
  */
-#define error_report_once(fmt, ...)             \
-    ({                                          \
-        static bool print_once_;                \
-        bool ret_print_once_ = !print_once_;    \
-                                                \
-        if (!print_once_) {                     \
-            print_once_ = true;                 \
-            error_report(fmt, ##__VA_ARGS__);   \
-        }                                       \
-        unlikely(ret_print_once_);              \
+#define error_report_once(fmt, ...)                     \
+    ({                                                  \
+        static bool print_once_;                        \
+        error_report_once_cond(&print_once_,            \
+                               fmt, ##__VA_ARGS__);     \
     })
 
 /*
  * Similar to warn_report(), except it prints the message just once.
  * Return true when it prints, false otherwise.
  */
-#define warn_report_once(fmt, ...)              \
-    ({                                          \
-        static bool print_once_;                \
-        bool ret_print_once_ = !print_once_;    \
-                                                \
-        if (!print_once_) {                     \
-            print_once_ = true;                 \
-            warn_report(fmt, ##__VA_ARGS__);    \
-        }                                       \
-        unlikely(ret_print_once_);              \
+#define warn_report_once(fmt, ...)                      \
+    ({                                                  \
+        static bool print_once_;                        \
+        warn_report_once_cond(&print_once_,             \
+                              fmt, ##__VA_ARGS__);      \
     })
 
 const char *error_get_progname(void);