dbg(backend): rollback a change

Rollback to test/check this issue : https://github.com/Guenael/rtlsdr-wsprd/issues/59

Note : Will generate an error back-end side, by the code checker.

wsprd/wsprsim_utils.c

@@ -118,9 +118,9 @@ void pack_prefix(char *callsign, int32_t *n, int32_t *m, int32_t *nadd) {
         *m = 10 * (callsign[i1 + 1] - 48) + (callsign[i1 + 2] - 48);
         *m = 60000 + 26 + *m;
     } else {
-        // three chars or more
         char *pfx = strtok(callsign, "/");
-        *n = pack_call(strtok(NULL, " "));
+        call6 = strtok(NULL, " ");
+        *n = pack_call(call6);
         int plen = strlen(pfx);
         if (plen == 1) {
             *m = 36;