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The isprint() checks printability across all 256 characters, some of the upper 128 characters are printable and produce artifacts on UART. Call isascii() first to only consider the bottom 7bit ASCII characters as printable, and then check their printability using isprint(). This fixes a rare misprint in case the ID page content is uninitialized or corrupted. Signed-off-by: Marek Vasut <marek.vasut@mailbox.org> Reviewed-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>