fs: fat: write returns error code instead of -1
It would be good that FAT write function return error code instead of just returning -1 as fat_read_file() does. This patch attempts to address this issue although it is 'best effort (or estimate)' for now. Signed-off-by: NAKASHI Takahiro <takahiro.akashi@linaro.org> Signed-off-by: NAlexander Graf <agraf@suse.de>
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