parisc: remove redundant initialization in sigsegv path of sys_rt_sigreturn

sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)

{

	struct rt_sigframe __user *frame;

	struct siginfo si;

	sigset_t set;

	unsigned long usp = (regs->gr[30] & ~(0x01UL));

	unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE;

give_sigsegv:

	DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n");

	si.si_signo = SIGSEGV;

	si.si_errno = 0;

	si.si_code = SI_KERNEL;

	si.si_pid = task_pid_vnr(current);

	si.si_uid = current_uid();

	si.si_addr = &frame->uc;

	force_sig_info(SIGSEGV, &si, current);

	force_sig(SIGSEGV, current);

	return;

}