drm/xe/devcoredump: Print errno if VM snapshot was not captured

My testing machine has only 8GB of RAM and while running piglit tests
I can reach the OOM cache in xe_vm_snapshot_capture() snap allocaiton
sometimes.

So to differentiate the OOM from race between capture and UMDs
unbinbind VMs here I'm adding a '[0].error: -12' to devcoredump.

v2:
- fix returned errno values

Cc: Maarten Lankhorst <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Signed-off-by: José Roberto de Souza <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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