SongSticker: add Database reference parameter

src/command/StickerCommands.cxx

@@ -133,7 +133,7 @@ handle_sticker_song(Client &client, int argc, char *argv[])
 			argv[4],
 		};
 
-		success = sticker_song_find(base_uri, data.name,
+		success = sticker_song_find(*db, base_uri, data.name,
 					    sticker_song_find_print_cb, &data);
 		if (!success) {
 			command_error(client, ACK_ERROR_SYSTEM,

src/sticker/SongSticker.cxx

@@ -21,7 +21,6 @@
 #include "SongSticker.hxx"
 #include "StickerDatabase.hxx"
 #include "db/LightSong.hxx"
-#include "db/DatabaseGlue.hxx"
 #include "db/DatabasePlugin.hxx"
 #include "util/Error.hxx"
 
@@ -95,15 +94,13 @@ sticker_song_find_cb(const char *uri, const char *value, void *user_data)
 }
 
 bool
-sticker_song_find(const char *base_uri, const char *name,
+sticker_song_find(const Database &db, const char *base_uri, const char *name,
 		  void (*func)(const LightSong &song, const char *value,
 			       void *user_data),
 		  void *user_data)
 {
 	struct sticker_song_find_data data;
-	data.db = GetDatabase();
-	assert(data.db != nullptr);
-
+	data.db = &db;
 	data.func = func;
 	data.user_data = user_data;
 

src/sticker/SongSticker.hxx

@@ -25,8 +25,8 @@
 #include <string>
 
 struct LightSong;
-struct Directory;
 struct sticker;
+class Database;
 
 /**
  * Returns one value from a song's sticker record.  The caller must
@@ -78,7 +78,7 @@ sticker_song_get(const LightSong &song);
  * failure
  */
 bool
-sticker_song_find(const char *base_uri, const char *name,
+sticker_song_find(const Database &db, const char *base_uri, const char *name,
 		  void (*func)(const LightSong &song, const char *value,
 			       void *user_data),
 		  void *user_data);