drm/xe/xe_devcoredump: Check NULL before assignments

Assign 'xe_devcoredump_snapshot *' and 'xe_device *' only if
'coredump' is not NULL.

v2
- Fix commit messages.

v3
- Define variables before code.(Ashutosh/Jose)

v4
- Drop return check for coredump_to_xe. (Jose/Rodrigo)

v5
- Modify misleading commit message. (Matt)

Cc: Matt Roper <[email protected]>
Cc: Ashutosh Dixit <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Signed-off-by: Himal Prasad Ghimiray <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Reviewed-by: José Roberto de Souza <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Rodrigo Vivi <[email protected]>

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