storage: use correct type for array count

Using size_t counts will let us use VIR_APPEND_ELEMENT and friends.

* src/conf/storage_conf.h (_virStoragePoolObjList)
(_virStorageVolDefList): Track list sizes with size_t.
* src/storage/storage_backend_rbd.c
(virStorageBackendRBDRefreshPool): Fix type fallout.
Signed-off-by: NEric Blake <eblake@redhat.com>

src/conf/storage_conf.h

@@ -112,7 +112,7 @@ struct _virStorageVolDef {
 typedef struct _virStorageVolDefList virStorageVolDefList;
 typedef virStorageVolDefList *virStorageVolDefListPtr;
 struct _virStorageVolDefList {
-    unsigned int count;
+    size_t count;
     virStorageVolDefPtr *objs;
 };
 
@@ -340,7 +340,7 @@ struct _virStoragePoolObj {
 typedef struct _virStoragePoolObjList virStoragePoolObjList;
 typedef virStoragePoolObjList *virStoragePoolObjListPtr;
 struct _virStoragePoolObjList {
-    unsigned int count;
+    size_t count;
     virStoragePoolObjPtr *objs;
 };
 

src/storage/storage_backend_rbd.c

@@ -381,7 +381,7 @@ static int virStorageBackendRBDRefreshPool(virConnectPtr conn,
         pool->volumes.objs[pool->volumes.count++] = vol;
     }
 
-    VIR_DEBUG("Found %d images in RBD pool %s",
+    VIR_DEBUG("Found %zu images in RBD pool %s",
               pool->volumes.count, pool->def->source.name);
 
     ret = 0;