fat: follow rename pack_hex_byte() to hex_byte_pack()

There is no functional change.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 5efbd5d..aca191b 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -156,8 +156,8 @@
 		} else {
 			if (uni_xlate == 1) {
 				*op++ = ':';
-				op = pack_hex_byte(op, ec >> 8);
-				op = pack_hex_byte(op, ec);
+				op = hex_byte_pack(op, ec >> 8);
+				op = hex_byte_pack(op, ec);
 				len -= 5;
 			} else {
 				*op++ = '?';