10703 smatch unreachable code checking needs reworking
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Yuri Pankov <yuri.pankov@nexenta.com>

@@ -1921,11 +1921,10 @@
 
         /*
          * Now we are done with the startup thread, so free it up.
          */
         thread_exit();
-        panic("mp_startup: cannot return");
         /*NOTREACHED*/
 }
 
 /*
  * Startup function for 'other' CPUs at boot time (besides boot cpu).