fs/ecryptfs/crypto.c: make ecryptfs_encode_for_filename() static

the function ecryptfs_encode_for_filename() is only used in this file

Signed-off-by: Cong Ding <dinggnu@gmail.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index ea99312..a7b0c2d 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1935,7 +1935,7 @@
  * @src: Source location for the filename to encode
  * @src_size: Size of the source in bytes
  */
-void ecryptfs_encode_for_filename(unsigned char *dst, size_t *dst_size,
+static void ecryptfs_encode_for_filename(unsigned char *dst, size_t *dst_size,
 				  unsigned char *src, size_t src_size)
 {
 	size_t num_blocks;