ID3 initialization was missing comment = NULL ... that could have nasty consequences, an invalid pointer being presented if a new track didn't overwrite it.

git-svn-id: svn://scm.orgis.org/mpg123/trunk@1243 35dc7657-300d-0410-a2e5-dc2837fedb53

src/libmpg123/stringbuf.c

@@ -57,6 +57,7 @@ int mpg123_copy_string(mpg123_string* from, mpg123_string* to)
 	char  *text;
 	if(to == NULL) return -1;
 
+	debug2("called copy_string with %p -> %p", from, to);
 	if(from == NULL)
 	{
 		fill = 0;