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gallium/auxiliary/vl: fix typo which negatively impacts the src_stride initialization

Patrick Lerda requested to merge noblock/mesa:galliumauxiliaryvlfixtypostride into main

What does this MR do and why?

gallium/auxiliary/vl: fix typo which negatively impacts the src_stride initialization

Note: As a matter of fact, this change by itself makes vdpau on r600 works again.
Indeed, r600 sets the stride value with vertex_buffer_index as the r600 index;
vertex_buffer_index was set to zero at the vl_compositor/init_buffers() stage on
the three elements. As a consequence of this typo the stride value was overwritten
to zero. This was breaking vdpau.

Fixes: 76725452 ("gallium: move vertex stride to CSO")
Related: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10468
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10267
Signed-off-by: Patrick Lerda <patrick9876@free.fr>
Edited by Patrick Lerda

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