[db] Use default -1 for playlists.query_limit column

src/db.h

@@ -248,7 +248,7 @@ struct playlist_info {
   uint32_t parent_id;    /* Id of parent playlist if the playlist is nested */
   uint32_t directory_id; /* Id of directory */
   char *query_order;     /* order by clause if it is a smart playlist */
-  uint32_t query_limit;  /* limit if it is a smart playlist */
+  int32_t query_limit;   /* limit if it is a smart playlist */
 };
 
 #define pli_offsetof(field) offsetof(struct playlist_info, field)

src/db_init.c

@@ -111,7 +111,7 @@
   "   parent_id      INTEGER DEFAULT 0,"		\
   "   directory_id   INTEGER DEFAULT 0,"		\
   "   query_order    VARCHAR(1024),"			\
-  "   query_limit    INTEGER DEFAULT 0"			\
+  "   query_limit    INTEGER DEFAULT -1"		\
   ");"
 
 #define T_PLITEMS				\

src/db_upgrade.c

@@ -1637,7 +1637,7 @@ static const struct db_upgrade_query db_upgrade_V1907_queries[] =
 #define U_V1908_ALTER_PL_ADD_ORDER \
   "ALTER TABLE playlists ADD COLUMN query_order VARCHAR(1024);"
 #define U_V1908_ALTER_PL_ADD_LIMIT \
-  "ALTER TABLE playlists ADD COLUMN query_limit INTEGER DEFAULT 0;"
+  "ALTER TABLE playlists ADD COLUMN query_limit INTEGER DEFAULT -1;"
 
 #define U_V1908_SCVER_MINOR \
   "UPDATE admin SET value = '08' WHERE key = 'schema_version_minor';"