Fix the build of key_ladder_demo under Clang
Clang -Wall -Wincompatible-pointer-types-discards-qualifiers said:
thou shalt not put a string literal in a non-const char*.
@@ -620,9 +620,9 @@ static void usage( void )
int main( int argc, char *argv[] )
{
- char *key_file_name = "master.key";
- char *input_file_name = NULL;
- char *output_file_name = NULL;
+ const char *key_file_name = "master.key";
+ const char *input_file_name = NULL;
+ const char *output_file_name = NULL;
const char *ladder[MAX_LADDER_DEPTH];
size_t ladder_depth = 0;
int i;
