avcodec/fmvc: use correct pixel format on big-endian for 16 bpp

libavcodec/fmvc.c

@@ -530,7 +530,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     switch (avctx->bits_per_coded_sample) {
     case 16:
-        avctx->pix_fmt = AV_PIX_FMT_RGB555;
+        avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
         break;
     case 24:
         avctx->pix_fmt = AV_PIX_FMT_BGR24;