!(STp->use_pf & PF_TESTED)) {
/* Try the other possible state of Page Format if not
already tried */
- STp->use_pf = !STp->use_pf | PF_TESTED;
+ STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
st_release_request(SRpnt);
SRpnt = NULL;
return st_int_ioctl(STp, cmd_in, arg);