Fixes:

../../ntpd/ntp_io.c:3241:11: warning: implicit declaration of function 'tval_stamp_to_lfp' is invalid in C99 [-Wimplicit-function-declaration]
                                nts = tval_stamp_to_lfp(*tvp);
                                      ^
../../ntpd/ntp_io.c:3241:9: error: assigning to 'l_fp' from incompatible type 'int'
                                nts = tval_stamp_to_lfp(*tvp);
                                    ^ ~~~~~~~~~~~~~~~~~~~~~~~
1 warning and 1 error generated.

Seen on OSX and NetBSD