um: switch UPT_SET_RETURN_VALUE and regs_return_value to pt_regs

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/um/kernel/skas/syscall.c

@@ -34,7 +34,7 @@ void handle_syscall(struct uml_pt_regs *r)
 		result = -ENOSYS;
 	else result = EXECUTE_SYSCALL(syscall, regs);
 
-	UPT_SET_SYSCALL_RETURN(r, result);
+	PT_REGS_SET_SYSCALL_RETURN(regs, result);
 
 	syscall_trace(r, 1);
 }