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Check for zero length in the legacy spi_flash_read() / spi_flash_write() / spi_flash_erase() functions. On zero length, return 0 immediately, don't call the underlying method. Rationale: - these legacy functions call the _read(), _write() and _erase() methods of struct mtd - the DM callers of these methods already check for zero length - making all callers of these methods check for zero length makes it possible to remove the check from implementations of these _read(), _write() and _erase() methods Signed-off-by: Marek Behún <marek.behun@nic.cz>
a67b3719