parisc: switch to generic compat rt_sigaction()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/parisc/kernel/syscall_table.S b/arch/parisc/kernel/syscall_table.S
index 883171e..dd52c23 100644
--- a/arch/parisc/kernel/syscall_table.S
+++ b/arch/parisc/kernel/syscall_table.S
@@ -265,7 +265,7 @@
 	ENTRY_SAME(prctl)
 	/* signals need a careful review */
 	ENTRY_SAME(rt_sigreturn_wrapper)
-	ENTRY_DIFF(rt_sigaction)
+	ENTRY_COMP(rt_sigaction)
 	ENTRY_COMP(rt_sigprocmask)	/* 175 */
 	ENTRY_COMP(rt_sigpending)
 	ENTRY_COMP(rt_sigtimedwait)