gallium/auxiliary/indices: consistently apply start only to input

The majority of these only apply the start argument to the input, but a few of them also does for the output-array. util_primconvert, the only user of this argument expects this pass a non-zero start-argument does not expect this to be applied to the output; if it is, it will write outside of allocated memory, leading to VRAM corruption.

The reason this doesn't seem to have been noticed before, is that no driver currently use util_primconvert to convert a primitive-type to itself, which is the cases where this was broken. But for Zink, this will no longer be true, because we need to eliminate the use of 8-bit index-buffers.

Signed-off-by: Erik Faye-Lund erik.faye-lund@collabora.com Fixes: 28f3f8d4 ("gallium/auxiliary/indices: add start param")