Update gen_packets.c

Fix truncation warnings from GCC 7.1

Author: DwaineGarden

gen_packets.c

@@ -619,7 +619,7 @@ int main(int argc, char **argv)
  */
 	  for (i = 1; i <= packet_count; i++) {
 
-	    char stemp[80];
+	    char stemp[88];
 
 	    if (modem.achan[0].baud < 600) {
 	      /* e.g. 300 bps AFSK - About 2/3 should be decoded properly. */
@@ -968,4 +968,4 @@ static int audio_file_close (void)
 
 void dcd_change (int chan, int subchan, int slice, int state)
 {
-}
+}