powerpc: don't bother with CHECK_FULL_REGS in sys_fork() et.al.

copy_thread() will do it anyway.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/powerpc/kernel/process.c

@@ -1030,7 +1030,6 @@ int sys_clone(unsigned long clone_flags, unsigned long usp,
 	      int __user *child_tidp, int p6,
 	      struct pt_regs *regs)
 {
-	CHECK_FULL_REGS(regs);
 	if (usp == 0)
 		usp = regs->gpr[1];	/* stack pointer for child */
  	return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
@@ -1040,7 +1039,6 @@ int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
 	     unsigned long p4, unsigned long p5, unsigned long p6,
 	     struct pt_regs *regs)
 {
-	CHECK_FULL_REGS(regs);
 	return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL);
 }
 
@@ -1048,7 +1046,6 @@ int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
 	      unsigned long p4, unsigned long p5, unsigned long p6,
 	      struct pt_regs *regs)
 {
-	CHECK_FULL_REGS(regs);
 	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1],
 			regs, 0, NULL, NULL);
 }