_libssh2_wait_socket: poll needs milliseconds
_libssh2_wait_socket: poll needs milliseconds

As reported on the mailing list, the code path using poll() should
multiple seconds with 1000 to get milliseconds, not divide!

Reported by: Jan Van Boghout

libssh2/libssh2,libssh2/libssh2,libssh2/libssh2,libssh2/libssh2