When we create a renderbuffer, we allocate a pipe_resource for it with a
given format. When we export the renderbuffer to an EGLImage, we go look
up what the GL format was and try to re-derive the pipe_format back
again.
Instead of doing that, just immediately reuse the pipe_format for the
image's format.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27709>
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