cmListFileLexer: Fix leak on error before EOF

Teach cmListFileLexerDestroy to call cmListFileLexerSetToken with a NULL
token to free the token string buffer.  Without this, if an error occurs
before the token cleanup happens when EOF is reached, then the token
string buffer may leak.

1 files changed, 1 insertions, 0 deletions

diff --git a/Source/cmListFileLexer.c b/Source/cmListFileLexer.c
index 2841fe5..f127add 100644
--- a/Source/cmListFileLexer.c
+++ b/Source/cmListFileLexer.c
@@ -2271,6 +2271,7 @@ static void cmListFileLexerInit(cmListFileLexer* lexer)
 /*--------------------------------------------------------------------------*/
 static void cmListFileLexerDestroy(cmListFileLexer* lexer)
 {
+  cmListFileLexerSetToken(lexer, 0, 0);
   if(lexer->file || lexer->string_buffer)
     {
     cmListFileLexer_yylex_destroy(lexer->scanner);