save_playlist: merge parameters "name" and "defaultname"

src/EditPlaylistPage.cxx

@@ -273,7 +273,7 @@ EditPlaylistPage::OnCommand(struct mpdclient &c, Command cmd)
 		return HandleDelete(c);
 
 	case Command::SAVE_PLAYLIST:
-		//playlist_save(&c, nullptr, nullptr);
+		//playlist_save(screen, c, nullptr);
 		// TODO
 		return true;
 

src/FileBrowserPage.cxx

@@ -210,10 +210,9 @@ FileBrowserPage::HandleSave(struct mpdclient &c) noexcept
 	}
 
 	if(defaultname)
-		playlist_save(screen, c, nullptr,
-			      Utf8ToLocaleZ{defaultname}.c_str());
+		playlist_save(screen, c, Utf8ToLocaleZ{defaultname}.c_str());
 	else
-		playlist_save(screen, c, nullptr, nullptr);
+		playlist_save(screen, c, nullptr);
 }
 
 void

src/QueuePage.cxx

@@ -624,7 +624,7 @@ QueuePage::OnCommand(struct mpdclient &c, Command cmd)
 	}
 
 	case Command::SAVE_PLAYLIST:
-		playlist_save(screen, c, nullptr, nullptr);
+		playlist_save(screen, c, nullptr);
 		return true;
 
 	case Command::ADD:

src/save_playlist.cxx

@@ -54,8 +54,7 @@ PlaylistNameCompletion::Post([[maybe_unused]] std::string_view value,
 
 int
 playlist_save(ScreenManager &screen, struct mpdclient &c,
-	      const char *name,
-	      const char *defaultname) noexcept
+	      const char *name) noexcept
 {
 	std::string filename;
 
@@ -70,7 +69,7 @@ playlist_save(ScreenManager &screen, struct mpdclient &c,
 
 		/* query the user for a filename */
 		filename = screen_readln(screen, _("Save queue as"),
-					 defaultname,
+					 nullptr,
 					 nullptr,
 					 completion);
 		if (filename.empty())

src/save_playlist.hxx

@@ -1,15 +1,11 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 // Copyright The Music Player Daemon Project
 
-#ifndef SAVE_PLAYLIST_H
-#define SAVE_PLAYLIST_H
+#pragma once
 
 class ScreenManager;
 struct mpdclient;
 
 int
 playlist_save(ScreenManager &screen, struct mpdclient &c,
-	      const char *name,
-	      const char *defaultname) noexcept;
-
-#endif
+	      const char *name) noexcept;