Database: Fix possible crash

The File Browser and Database apparently share
the same selected_item_history, which means that
selected_item can be -1 even in the context of the
database,

This leads to tree_get_file_position being called in
id3db mode, which isn't safe to do.

Change-Id: I46151e8a823afab0b57ad839cde13f6072b8917b

1 files changed, 5 insertions, 2 deletions

diff --git a/apps/tree.c b/apps/tree.c
index 2bccefa7a1..6e9ca106c0 100644
--- a/apps/tree.c
+++ b/apps/tree.c
@@ -392,8 +392,11 @@ static int update_dir(void)
     /* if selected item is undefined */
     if (tc.selected_item == -1)
     {
-        /* use lastfile to determine the selected item */
-        tc.selected_item = tree_get_file_position(lastfile);
+#ifdef HAVE_TAGCACHE
+        if (!id3db)
+#endif
+            /* use lastfile to determine the selected item */
+            tc.selected_item = tree_get_file_position(lastfile);
 
         /* If the file doesn't exists, select the first one (default) */
         if(tc.selected_item < 0)