Move the initialization on context definition. In amr.c, only the

amr_wb_encode_frame function initialized its context on a different line as it
defined it.
Patch by Benoit Fouet, benoit fouet % purplelabs com.

Originally committed as revision 8290 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/amr.c

@@ -607,9 +607,9 @@ static int amr_wb_encode_close(AVCodecContext * avctx)
 static int amr_wb_encode_frame(AVCodecContext *avctx,
                             unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
 {
-    AMRWBContext *s;
+    AMRWBContext *s = (AMRWBContext*) avctx->priv_data;
     int size;
-    s = (AMRWBContext*) avctx->priv_data;
+
     s->mode=getWBBitrateMode(avctx->bit_rate);
     size = E_IF_encode(s->state, s->mode, data, frame, s->allow_dtx);
     return size;