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Fix the following compile warning with hex2bin() usage: drivers/target/iscsi/iscsi_target_auth.c: In function ‘chap_string_to_hex’: drivers/target/iscsi/iscsi_target_auth.c:35: warning: ignoring return value of ‘hex2bin’, declared with attribute warn_unused_result Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>