st/va: use proper temp pipe_video_buffer template
st/va: use proper temp pipe_video_buffer template

Instead of changing the format on the existing template
which makes error handling not nice and confuses coverity.

CoverityID: 1337953

Signed-off-by: Julien Isorce <2904e845d63d102574cbb95a4bcdefac0a5d7af0@samsung.com>
Reviewed-by: Christian König <c7ea837d7a46effe4232b086213468b8b31643bf@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler