kernel: mtk_bmt: allow get_mapping_block to return an error
Used by the mapping implementation to indicate that no backing block is
available
Signed-off-by: NFelix Fietkau <nbd@nbd.name>
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Used by the mapping implementation to indicate that no backing block is
available
Signed-off-by: NFelix Fietkau <nbd@nbd.name>