parisc: ditto sys_accept4

tested with test_accept4.c from de11defebf00007677fb7ee91d9b089b78786fbb

Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
diff --git a/arch/parisc/kernel/syscall_table.S b/arch/parisc/kernel/syscall_table.S
index a0c54cf..de5f6da 100644
--- a/arch/parisc/kernel/syscall_table.S
+++ b/arch/parisc/kernel/syscall_table.S
@@ -418,6 +418,7 @@
 	ENTRY_COMP(rt_tgsigqueueinfo)
 	ENTRY_SAME(perf_event_open)
 	ENTRY_COMP(recvmmsg)
+	ENTRY_SAME(accept4)		/* 320 */
 
 	/* Nothing yet */