fixed a crash caused invalid Q choice

The commit fixed a problem by capping cpi->active_best_quality to be
smaller than cpi->worst_quality.  Also fixed a few line of code that
was misplaced.

Change-Id: Ie908264b72140c669122a0afde5d886619c33474

vp8/encoder/onyx_if.c

@@ -4180,6 +4180,9 @@ static void encode_frame_to_data_rate
     if (cpi->active_best_quality < cpi->best_quality)
         cpi->active_best_quality = cpi->best_quality;
 
+    if (cpi->active_best_quality > cpi->worst_quality)
+        cpi->active_best_quality = cpi->worst_quality;
+
     if ( cpi->active_worst_quality < cpi->active_best_quality )
         cpi->active_worst_quality = cpi->active_best_quality;
 

vp8/encoder/quantize.c

@@ -965,18 +965,17 @@ void vp8cx_init_quantizer(VP8_COMP *cpi)
     int i;
     int quant_val;
     int Q;
-
-    int zbin_boost[16] = {0, 0, 8, 10, 12, 14, 16, 20, 24, 28, 32, 36, 40, 44, 44, 44};
-
+    int zbin_boost[16] = { 0,  0,  8, 10, 12, 14, 16, 20,
+                          24, 28, 32, 36, 40, 44, 44, 44};
     int qrounding_factor = 48;
+
+    for (Q = 0; Q < QINDEX_RANGE; Q++)
+    {
 #if CONFIG_EXTEND_QRANGE
         int qzbin_factor = (vp8_dc_quant(Q,0) < 148) ? 84 : 80;
 #else
         int qzbin_factor = (vp8_dc_quant(Q,0) < 37) ? 84: 80;
 #endif
-
-    for (Q = 0; Q < QINDEX_RANGE; Q++)
-    {
         // dc values
         quant_val = vp8_dc_quant(Q, cpi->common.y1dc_delta_q);
         cpi->Y1quant_fast[Q][0] = (1 << 16) / quant_val;