drm/panic: Return errno codes if panic output fails

Return errno codes from the panic output helpers to detect invalid
panic handling. Avoid flushing the display if an error ocured. The
unflushed display output might be helpful in debugging.

For now, test the result values in the panic test cases. A later patch
will add support for retrying failed panic output.

v2:
- forward return value of draw_panic_screen_user() (Sashiko)
- forward errno code from drm_panic_get_qr_code

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patch.msgid.link/20260911124540.279841-5-tzimmermann@suse.de

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