Fix some minor compiler warnings.
Fix some minor compiler warnings.

x-itec/mod-authn-otp,pfiled/mod-authn-otp,sevenmine/mod-authn-otp,archiecobbs/mod-authn-otp,pfiled/mod-authn-otp,krpot/mod-authn-otp,githubert/mod-authn-otp,githubert/mod-authn-otp,x-itec/mod-authn-otp,krpot/mod-authn-otp,sevenmine/mod-authn-otp,archiecobbs/mod-authn-otp