flist->genre is defined as 'char genre[17]' so don't copy 22 into it

Patch by Kevin McCarthy <signals42@gmail.com>

--- librioutil/file_list.c
+++ librioutil/file_list.c
@@ -241,7 +241,7 @@
   strncpy(flist->title,  info.data->title, 64);
   strncpy(flist->album,  info.data->album, 64);
   strncpy(flist->name,   info.data->name, 64);
-  strncpy(flist->genre,  (char *)info.data->genre2, 22);
+  strncpy(flist->genre,  (char *)info.data->genre2, 17);
 
   strncpy(flist->year,   (char *)info.data->year2, 4);