yuv2rgb_mmx crashes with ffdivx codec, when we play back avi files that have

a frame width that is not an exact multiple of 8.

Testcase: 405.avi (356x240).  Playing on an MMX capable x86 system using the
x11 video-out driver results in a segfault.

The MMX routines convert image data in quantities of 8 pixels in each loop,
and the inner loop was not terminated in case there are only 1-7 pixels left,
producing too much RGB output.

For now, just ignore the last few pixels on each row, to avoid the segfaults.
(Gives a black vertical border on the right, if you play a video with
width%8 != 0)  A possible future enhancement would be, to add a second loop
to convert the last width%8 pixels to RGB using a byte loop.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@1307 b3059339-0415-0410-9bf9-f77b7e298cf2

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