alpha: fix compile problem in arch/alpha/kernel/signal.c

Tssk.  Apparently Al hadn't checked commit c52c2ddc ("alpha: switch
osf_sigprocmask() to use of sigprocmask()") at all. It doesn't compile.

Fixed as per suggestions from Michael Cree.
Reported-by: Michael Cree <mcree@orcon.net.nz>
Cc: Al Viro <viro@ftp.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/alpha/kernel/signal.c

@@ -49,10 +49,10 @@ SYSCALL_DEFINE2(osf_sigprocmask, int, how, unsigned long, newmask)
 	unsigned long res;
 
 	siginitset(&mask, newmask & ~_BLOCKABLE);
-	res = siprocmask(how, &mask, &oldmask);
+	res = sigprocmask(how, &mask, &oldmask);
 	if (!res) {
 		force_successful_syscall_return();
-		res = oldmask->sig[0];
+		res = oldmask.sig[0];
 	}
 	return res;
 }