aufs: minor bugfix, stop exposing kconfig to userspace

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 75664fa01701d5f79e6cee87a800354df6e70f70)

include/uapi/linux/aufs_type.h

@@ -34,6 +34,7 @@
 
 /* ---------------------------------------------------------------------- */
 
+#ifdef __KERNEL__
 #ifdef CONFIG_AUFS_BRANCH_MAX_127
 typedef int8_t aufs_bindex_t;
 #define AUFS_BRANCH_MAX 127
@@ -48,7 +49,6 @@ typedef int16_t aufs_bindex_t;
 #endif
 #endif
 
-#ifdef __KERNEL__
 #ifndef AUFS_BRANCH_MAX
 #error unknown CONFIG_AUFS_BRANCH_MAX value
 #endif