db/update/VirtualDirectory: rename MakeDirectoryIfModified()

src/db/update/Container.cxx

@@ -45,7 +45,8 @@ UpdateWalk::UpdateContainerFile(Directory &directory,
 	Directory *contdir;
 	{
 		const ScopeDatabaseLock protect;
-		contdir = MakeDirectoryIfModified(directory, name, info);
+		contdir = MakeVirtualDirectoryIfModified(directory, name,
+							 info);
 		if (contdir == nullptr)
 			/* not modified */
 			return true;

src/db/update/VirtualDirectory.cxx

@@ -22,7 +22,7 @@
 #include "storage/FileInfo.hxx"
 
 Directory *
-UpdateWalk::MakeDirectoryIfModified(Directory &parent, const char *name,
+UpdateWalk::MakeVirtualDirectoryIfModified(Directory &parent, const char *name,
 					   const StorageFileInfo &info) noexcept
 {
 	Directory *directory = parent.FindChild(name);

src/db/update/Walk.hxx

@@ -142,7 +142,8 @@ private:
 	 *
 	 * The caller must lock the database.
 	 */
-	Directory *MakeDirectoryIfModified(Directory &parent, const char *name,
+	Directory *MakeVirtualDirectoryIfModified(Directory &parent,
+						  const char *name,
 						  const StorageFileInfo &info) noexcept;
 
 	Directory *DirectoryMakeChildChecked(Directory &parent,