RTEMS | bsps/powerpc: Address -Wsign-compare warnings (!1009)

[Joel Sherrill (@joel)]

Joel Sherrill commented on a discussion on bsps/powerpc/tqm8xx/spi/spi.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1009#note_141572

 >  #if defined(DEBUG)
 >    printk("... exit OK, rc=%d\r\n",bc);
 >  #endif
 > -  return (rc == RTEMS_SUCCESSFUL) ? bc : -rc;
 > +  if (rc == RTEMS_SUCCESSFUL) {
 > +    return bc;
 > +  }
 > +  return -rc;

Yes. There were a few inline conditionals like this where rc (enum rtems_status_code) is checked and either an integer or negative rtems_status_code is returned. Breaking it apart addressed these sign-compare warnings without adding any csats.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1009#note_141572
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