Clean up cppcheck warnings in cnctrack

cnctrk/cnctrk.c

@@ -52,8 +52,6 @@ cnctrk_set_position(ROT *rot, azimuth_t az, elevation_t el)
 
     sprintf(axcmd, "/usr/bin/axis-remote --mdi 'G00 X %6.2f Y %6.2f' \n", az, el);
     return retval = system(axcmd);
-
-    return RIG_OK;
 }