object: rename link "child" to "target"

A child property is a different kind of property. Let's use "target"
for the link target.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20200110153039.1379601-14-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/qom/object.h

@@ -1528,7 +1528,7 @@ void object_property_allow_set_link(const Object *, const char *,
  * @obj: the object to add a property to
  * @name: the name of the property
  * @type: the qobj type of the link
- * @child: a pointer to where the link object reference is stored
+ * @targetp: a pointer to where the link object reference is stored
  * @check: callback to veto setting or NULL if the property is read-only
  * @flags: additional options for the link
  * @errp: if an error occurs, a pointer to an area to store the error
@@ -1553,7 +1553,7 @@ void object_property_allow_set_link(const Object *, const char *,
  * modified.
  */
 void object_property_add_link(Object *obj, const char *name,
-                              const char *type, Object **child,
+                              const char *type, Object **targetp,
                               void (*check)(const Object *obj, const char *name,
                                             Object *val, Error **errp),
                               ObjectPropertyLinkFlags flags,

qom/object.c

@@ -1713,7 +1713,7 @@ void object_property_allow_set_link(const Object *obj, const char *name,
 }
 
 typedef struct {
-    Object **child;
+    Object **targetp;
     void (*check)(const Object *, const char *, Object *, Error **);
     ObjectPropertyLinkFlags flags;
 } LinkProperty;
@@ -1723,11 +1723,11 @@ static void object_get_link_property(Object *obj, Visitor *v,
                                      Error **errp)
 {
     LinkProperty *lprop = opaque;
-    Object **child = lprop->child;
+    Object **targetp = lprop->targetp;
     gchar *path;
 
-    if (*child) {
-        path = object_get_canonical_path(*child);
+    if (*targetp) {
+        path = object_get_canonical_path(*targetp);
         visit_type_str(v, name, &path, errp);
         g_free(path);
     } else {
@@ -1782,8 +1782,8 @@ static void object_set_link_property(Object *obj, Visitor *v,
 {
     Error *local_err = NULL;
     LinkProperty *prop = opaque;
-    Object **child = prop->child;
-    Object *old_target = *child;
+    Object **targetp = prop->targetp;
+    Object *old_target = *targetp;
     Object *new_target = NULL;
     char *path = NULL;
 
@@ -1805,7 +1805,7 @@ static void object_set_link_property(Object *obj, Visitor *v,
         return;
     }
 
-    *child = new_target;
+    *targetp = new_target;
     if (prop->flags & OBJ_PROP_LINK_STRONG) {
         object_ref(new_target);
         object_unref(old_target);
@@ -1816,22 +1816,22 @@ static Object *object_resolve_link_property(Object *parent, void *opaque, const
 {
     LinkProperty *lprop = opaque;
 
-    return *lprop->child;
+    return *lprop->targetp;
 }
 
 static void object_release_link_property(Object *obj, const char *name,
                                          void *opaque)
 {
     LinkProperty *prop = opaque;
 
-    if ((prop->flags & OBJ_PROP_LINK_STRONG) && *prop->child) {
-        object_unref(*prop->child);
+    if ((prop->flags & OBJ_PROP_LINK_STRONG) && *prop->targetp) {
+        object_unref(*prop->targetp);
     }
     g_free(prop);
 }
 
 void object_property_add_link(Object *obj, const char *name,
-                              const char *type, Object **child,
+                              const char *type, Object **targetp,
                               void (*check)(const Object *, const char *,
                                             Object *, Error **),
                               ObjectPropertyLinkFlags flags,
@@ -1842,7 +1842,7 @@ void object_property_add_link(Object *obj, const char *name,
     gchar *full_type;
     ObjectProperty *op;
 
-    prop->child = child;
+    prop->targetp = targetp;
     prop->check = check;
     prop->flags = flags;