iscsi-scst: Fix wrong variable in chap_calc_digest_af_alg memcpy#342
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iscsi-scst: Fix wrong variable in chap_calc_digest_af_alg memcpy#342
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Use 'bytes' (the return value from af_alg_final) instead of 'res' (which is 0 after the last successful af_alg_update call) when copying the digest. This bug caused the memcpy to copy 0 bytes, resulting in an uninitialized digest buffer. It also triggered a GCC -Werror=stringop-overflow warning because 'res' could theoretically be negative, leading to a huge unsigned size.
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Use 'bytes' (the return value from af_alg_final) instead of 'res' (which is 0 after the last successful af_alg_update call) when copying the digest.
This bug caused the memcpy to copy 0 bytes, resulting in an uninitialized digest buffer. It also triggered a GCC -Werror=stringop-overflow warning because 'res' could theoretically be negative, leading to a huge unsigned size.