minigbm: i915_add_combinations() cleanup: don't reuse |metadata|

|metadata| is reused for a couple of different tiling modes
which makes it hard to read what's used where. This CL
uses a different, named, variable for each case.

No new functionality intended, just cleanup.

BUG=b:183760490
TEST=CQ

Change-Id: If92fddd1cb458598277af51968e0446a8a0abbc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/2830691
Tested-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
1 file changed