consolidate compat lookup_dcookie()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index b0cc2a7..6852d48 100644
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -259,12 +259,6 @@
 			     merge_64(len_a4, len_a5));
 }
 
-asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf,
-	size_t len)
-{
-	return sys_lookup_dcookie(merge_64(a0, a1), buf, len);
-}
-
 SYSCALL_DEFINE6(32_fanotify_mark, int, fanotify_fd, unsigned int, flags,
 		u64, a3, u64, a4, int, dfd, const char	__user *, pathname)
 {
diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S
index c1a70e8..91c8c6e 100644
--- a/arch/mips/kernel/scall64-o32.S
+++ b/arch/mips/kernel/scall64-o32.S
@@ -439,7 +439,7 @@
 	PTR	compat_sys_io_submit
 	PTR	sys_io_cancel			/* 4245 */
 	PTR	sys_exit_group
-	PTR	sys32_lookup_dcookie
+	PTR	compat_sys_lookup_dcookie
 	PTR	sys_epoll_create
 	PTR	sys_epoll_ctl
 	PTR	sys_epoll_wait			/* 4250 */