avcodec/ppc/hpeldsp_altivec: Fix left-shift of negative number
It is UB and affected e.g. the vp5 and vp61 FATE tests: https://fate.ffmpeg.org/report.cgi?time=20240327083327&slot=ppc-linux-gcc-13.2-ubsan-altivec-qemuSigned-off-by:Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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