tcg: Add some assertions

Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

tcg/tcg.c

@@ -794,7 +794,9 @@ static char *tcg_get_arg_str_idx(TCGContext *s, char *buf, int buf_size,
 {
     TCGTemp *ts;
 
+    assert(idx >= 0 && idx < s->nb_temps);
     ts = &s->temps[idx];
+    assert(ts);
     if (idx < s->nb_globals) {
         pstrcpy(buf, buf_size, ts->name);
     } else {