Use generic compat_sys_wait4 to implement 32-bit wait4(2).

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index e52049c..3a56056 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -176,7 +176,7 @@
 	PTR	sys_fork
 	PTR	sys32_execve
 	PTR	sys_exit
-	PTR	sys32_wait4
+	PTR	compat_sys_wait4
 	PTR	sys_kill			/* 6060 */
 	PTR	sys32_newuname
 	PTR	sys_semget