monitor: Change return type of monitor_cur_is_qmp() to bool

Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NLuiz Capitulino <lcapitulino@redhat.com>

include/monitor/monitor.h

@@ -16,7 +16,7 @@ extern Monitor *default_mon;
 #define MONITOR_USE_CONTROL   0x04
 #define MONITOR_USE_PRETTY    0x08
 
-int monitor_cur_is_qmp(void);
+bool monitor_cur_is_qmp(void);
 
 void monitor_init(CharDriverState *chr, int flags);
 

monitor.c

@@ -239,8 +239,10 @@ static inline bool monitor_is_qmp(const Monitor *mon)
     return (mon->flags & MONITOR_USE_CONTROL);
 }
 
-/* Return non-zero iff we have a current monitor, and it is in QMP mode.  */
-int monitor_cur_is_qmp(void)
+/**
+ * Is the current monitor, if any, a QMP monitor?
+ */
+bool monitor_cur_is_qmp(void)
 {
     return cur_mon && monitor_is_qmp(cur_mon);
 }

stubs/mon-is-qmp.c

 #include "qemu-common.h"
 #include "monitor/monitor.h"
 
-int monitor_cur_is_qmp(void)
+bool monitor_cur_is_qmp(void)
 {
-    return 0;
+    return false;
 }