lib: dont call EVP_cleanup in fp2str
lib: dont call EVP_cleanup in fp2str

Calling EVP_cleanup here undoes initialization already done in
lib/fetch/common.c ssl_init() causing subsequent attempts to call
SSL_CTX_new() to fail. Which ultimately is the root cause for #170.

Fixes #170

ebfe/xbps,ebfe/xbps,ebfe/xbps