Fix signedness bug in RSA_Sign call #159
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In libopendkim's
dkim_eom_sign, the call toRSA_Signuses a variable of a signed type where an unsigned type is required. This manifested as a failure to sign on an S/390 machine and was reported in the Debian bug tracker.The problem was analysed and patched by Martin Grimm.
This bug is forwarded from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1012506