syscall separation part 14 for review

[David P. Reese, Jr.]

Kill two more stackgap allocations.  One is in linux_sysctl().  The other
is in linux_rt_sigreturn().

http://www.gomerbud.com/daver/patches/dragonfly/syscall-separation-14.diff

-- 
   David P. Reese, Jr.                                     daver at xxxxxxxxxxxx
                                               http://www.gomerbud.com/daver/