fix bool variables checking and assignment

lib/cookie.c

lib/cyassl.c

lib/formdata.c

lib/ftp.c

lib/http.c

lib/http_chunks.c

lib/imap.c

lib/multi.c

lib/nonblock.c

lib/pop3.c

lib/sendf.c

lib/smtp.c

lib/socks.c

lib/ssh.c

lib/sslgen.c

lib/ssluse.c

lib/telnet.c

lib/tftp.c

lib/transfer.c

lib/url.c