mem: fix TLSF max pool limit

mem/tlsf.c

@@ -47,7 +47,7 @@ enum tlsf_private
 	** TODO: We can increase this to support larger sizes, at the expense
 	** of more overhead in the TLSF structure.
 	*/
-	FL_INDEX_MAX = 40,
+	FL_INDEX_MAX = 39,
 #else
 	FL_INDEX_MAX = 30,
 #endif