Merge some declarations and initializations.

This fixes compilation failures related to START_TIMER/STOP_TIMER macros and
-Werror=declaration-after-statement.  START_TIMER declares variables and thus
may not be placed after statements outside of a new block.

libavcodec/dnxhdenc.c

@@ -580,9 +580,9 @@ static int dnxhd_encode_thread(AVCodecContext *avctx, void *arg, int jobnr, int
 
         for (i = 0; i < 8; i++) {
             DCTELEM *block = ctx->blocks[i];
-            int last_index, overflow;
-            int n = dnxhd_switch_matrix(ctx, i);
-            last_index = ctx->m.dct_quantize(&ctx->m, block, i, qscale, &overflow);
+            int overflow, n = dnxhd_switch_matrix(ctx, i);
+            int last_index = ctx->m.dct_quantize(&ctx->m, block, i,
+                                                 qscale, &overflow);
             //START_TIMER;
             dnxhd_encode_block(ctx, block, last_index, n);
             //STOP_TIMER("encode_block");

libavcodec/h264.c

@@ -4126,9 +4126,7 @@ int main(void){
 
     init_get_bits(&gb, temp, 8*SIZE);
     for(i=0; i<COUNT; i++){
-        int j, s;
-
-        s= show_bits(&gb, 24);
+        int j, s = show_bits(&gb, 24);
 
         START_TIMER
         j= get_ue_golomb(&gb);
@@ -4151,9 +4149,7 @@ int main(void){
 
     init_get_bits(&gb, temp, 8*SIZE);
     for(i=0; i<COUNT; i++){
-        int j, s;
-
-        s= show_bits(&gb, 24);
+        int j, s = show_bits(&gb, 24);
 
         START_TIMER
         j= get_se_golomb(&gb);