create_server_ssl_connection(): Declare a variable at the beginning of the code block

create_server_ssl_connection(): Declare a variable at the beginning of the code block

... to silence:
    cc -c -pipe -fstack-protector-all -ggdb -Wshadow  -Wconversion -I/usr/local/include/  -pthread -Wall -std=c89   openssl.c -o openssl.o
    openssl.c:1144:12: warning: GCC does not allow variable declarations in for loop initializers before C99 [-Wgcc-compat]
          for (int i = 0; i < sk_X509_num(chain); i++)
               ^