csn1: fix some mistaken CSN.1 error names

Change-Id: I3bd9954ee36212c94f0c4d91581da300c56fce60
diff --git a/src/csn1.cpp b/src/csn1.cpp
index 7e75972..01e3a43 100644
--- a/src/csn1.cpp
+++ b/src/csn1.cpp
@@ -103,8 +103,8 @@
   { CSN_ERROR_IN_SCRIPT,                  "IN SCRIPT" },
   { CSN_ERROR_INVALID_UNION_INDEX,        "INVALID UNION INDEX" },
   { CSN_ERROR_NEED_MORE_BITS_TO_UNPACK,   "NEED_MORE BITS TO UNPACK" },
-  { CSN_ERROR_NEED_MORE_BITS_TO_UNPACK,   "ILLEGAL BIT VALUE" },
-  { CSN_ERROR_ILLEGAL_BIT_VALUE,          "Internal" },
+  { CSN_ERROR_ILLEGAL_BIT_VALUE,          "ILLEGAL BIT VALUE" },
+  { CSN_ERROR_INTERNAL,                   "INTERNAL" },
   { CSN_ERROR_STREAM_NOT_SUPPORTED,       "STREAM_NOT_SUPPORTED" },
   { CSN_ERROR_MESSAGE_TOO_LONG,           "MESSAGE_TOO_LONG" },
   { 0, NULL }