* oooooops - sorry for this one - wrong logic

  empty dsp_mask - no change
  FORCE - add,  no FORCE - enabled bits are masked out

Originally committed as revision 1659 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/i386/dsputil_mmx.c

@@ -1441,10 +1441,12 @@ void dsputil_init_mmx(DSPContext* c, AVCodecContext *avctx)
 {
     mm_flags = mm_support();
 
-    if (avctx->dsp_mask && FF_MM_FORCE)
-	mm_flags |= (avctx->dsp_mask & 0xffff);
-    else
-        mm_flags &= (avctx->dsp_mask & 0xffff);
+    if (avctx->dsp_mask) {
+	if (avctx->dsp_mask & FF_MM_FORCE)
+	    mm_flags |= (avctx->dsp_mask & 0xffff);
+	else
+	    mm_flags &= ~(avctx->dsp_mask & 0xffff);
+    }
 
 #if 0
     fprintf(stderr, "libavcodec: CPU flags:");