Introduce virStoragePoolSourceDeviceClear

Open-coding one VIR_FREE in the test suite just doesn't seem right.

src/conf/storage_conf.c

@@ -356,6 +356,13 @@ virStoragePoolSourceAdapterClear(virStoragePoolSourceAdapter adapter)
     }
 }
 
+void
+virStoragePoolSourceDeviceClear(virStoragePoolSourceDevicePtr dev)
+{
+    VIR_FREE(dev->freeExtents);
+    VIR_FREE(dev->path);
+}
+
 void
 virStoragePoolSourceClear(virStoragePoolSourcePtr source)
 {
@@ -369,10 +376,8 @@ virStoragePoolSourceClear(virStoragePoolSourcePtr source)
     }
     VIR_FREE(source->hosts);
 
-    for (i = 0; i < source->ndevice; i++) {
-        VIR_FREE(source->devices[i].freeExtents);
-        VIR_FREE(source->devices[i].path);
-    }
+    for (i = 0; i < source->ndevice; i++)
+        virStoragePoolSourceDeviceClear(&source->devices[i]);
     VIR_FREE(source->devices);
     VIR_FREE(source->dir);
     VIR_FREE(source->name);

src/conf/storage_conf.h

@@ -432,6 +432,7 @@ int virStoragePoolObjDeleteDef(virStoragePoolObjPtr pool);
 
 void virStorageVolDefFree(virStorageVolDefPtr def);
 void virStoragePoolSourceClear(virStoragePoolSourcePtr source);
+void virStoragePoolSourceDeviceClear(virStoragePoolSourceDevicePtr dev);
 void virStoragePoolSourceFree(virStoragePoolSourcePtr source);
 void virStoragePoolDefFree(virStoragePoolDefPtr def);
 void virStoragePoolObjFree(virStoragePoolObjPtr pool);

src/libvirt_private.syms

@@ -710,6 +710,7 @@ virStoragePoolObjUnlock;
 virStoragePoolSourceAdapterTypeTypeFromString;
 virStoragePoolSourceAdapterTypeTypeToString;
 virStoragePoolSourceClear;
+virStoragePoolSourceDeviceClear;
 virStoragePoolSourceFindDuplicate;
 virStoragePoolSourceFindDuplicateDevices;
 virStoragePoolSourceFree;