balloon: Make functions, local vars static

balloon.h had function declarations for a couple of functions that are
local to balloon.c.  Make them static.

Drop the 'qemu_' prefix for balloon.c-local variables, and make them
static.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
diff --git a/balloon.c b/balloon.c
index 248c1b5..f9bcf07 100644
--- a/balloon.c
+++ b/balloon.c
@@ -31,30 +31,30 @@
 #include "trace.h"
 
 
-static QEMUBalloonEvent *qemu_balloon_event;
-void *qemu_balloon_event_opaque;
+static QEMUBalloonEvent *balloon_event_fn;
+static void *balloon_opaque;
 
 void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
 {
-    qemu_balloon_event = func;
-    qemu_balloon_event_opaque = opaque;
+    balloon_event_fn = func;
+    balloon_opaque = opaque;
 }
 
-int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque)
+static int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque)
 {
-    if (qemu_balloon_event) {
-        trace_balloon_event(qemu_balloon_event_opaque, target);
-        qemu_balloon_event(qemu_balloon_event_opaque, target, cb, opaque);
+    if (balloon_event_fn) {
+        trace_balloon_event(balloon_opaque, target);
+        balloon_event_fn(balloon_opaque, target, cb, opaque);
         return 1;
     } else {
         return 0;
     }
 }
 
-int qemu_balloon_status(MonitorCompletion cb, void *opaque)
+static int qemu_balloon_status(MonitorCompletion cb, void *opaque)
 {
-    if (qemu_balloon_event) {
-        qemu_balloon_event(qemu_balloon_event_opaque, 0, cb, opaque);
+    if (balloon_event_fn) {
+        balloon_event_fn(balloon_opaque, 0, cb, opaque);
         return 1;
     } else {
         return 0;
diff --git a/balloon.h b/balloon.h
index d478e28..06a8a46 100644
--- a/balloon.h
+++ b/balloon.h
@@ -21,10 +21,6 @@
 
 void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque);
 
-int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque);
-
-int qemu_balloon_status(MonitorCompletion cb, void *opaque);
-
 void monitor_print_balloon(Monitor *mon, const QObject *data);
 int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque);
 int do_balloon(Monitor *mon, const QDict *params,