util: storagefile: Add function to free a virStorageSourcePtr

Add a free function as some parts of the code will allocate the
structure.

src/libvirt_private.syms

@@ -1842,6 +1842,7 @@ virStorageNetHostTransportTypeToString;
 virStorageNetProtocolTypeToString;
 virStorageSourceAuthClear;
 virStorageSourceClear;
+virStorageSourceFree;
 virStorageSourceGetActualType;
 virStorageSourcePoolDefFree;
 virStorageSourcePoolModeTypeFromString;

src/util/virstoragefile.c

@@ -1719,3 +1719,14 @@ virStorageSourceClear(virStorageSourcePtr def)
     virStorageNetHostDefFree(def->nhosts, def->hosts);
     virStorageSourceAuthClear(def);
 }
+
+
+void
+virStorageSourceFree(virStorageSourcePtr def)
+{
+    if (!def)
+        return;
+
+    virStorageSourceClear(def);
+    VIR_FREE(def);
+}

src/util/virstoragefile.h

@@ -333,5 +333,6 @@ void virStorageSourceAuthClear(virStorageSourcePtr def);
 void virStorageSourcePoolDefFree(virStorageSourcePoolDefPtr def);
 void virStorageSourceClear(virStorageSourcePtr def);
 int virStorageSourceGetActualType(virStorageSourcePtr def);
+void virStorageSourceFree(virStorageSourcePtr def);
 
 #endif /* __VIR_STORAGE_FILE_H__ */