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Fix the maximum size of the coredump generated with current mt7921
firmware. Otherwise, a truncated coredump would be reported to userland
via dev_coredumpv.

Also, there is an additional error handling enhanced in the patch to avoid
the possible invalid buffer access when the system failed to create the
buffer to hold the coredump.

Fixes: 0da3c795

 ("mt76: mt7921: add coredump support")
Co-developed-by: YN Chen <YN.Chen@mediatek.com>
Signed-off-by: YN Chen <YN.Chen@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>