variable reassigned a value before the old one has been used

Detected by Cppcheck 1.74.

Author: ptroja

time_unix.c

@@ -90,6 +90,9 @@ kt_setfreq(struct ocx *ocx, double frequency)
 
 	tx.status = STA_PLL | STA_FREQHOLD;
 	tx.modes = MOD_FREQUENCY;
+        /* [time_unix.c:84] -> [time_unix.c:92]:
+         * (style) Variable 'modes' is reassigned a value
+         *  before the old one has been used. */
 	tx.freq = (long)floor(frequency * (65536 * 1e6));
 	errno = 0;
 	i = ntp_adjtime(&tx);