unescape() could read the source buffer out of bounds for inputs like "\\x" and could write the destination buffer out of bounds due to lack of checking against the len parameter. For better readability and consistency, rewrite it as a simplified version of unescape_string() in string_helpers.h. This includes rearranging src and dst parameters. Signed-off-by: Jonas Rebmann <jre@pengutronix.de> Link: https://patch.msgid.link/20260924-spi-sun4i-spidev_test-v7-13-126e31a07fdc@pengutronix.de Signed-off-by: Mark Brown <broonie@kernel.org>