[app-isoldr] Removed unnecessary mutex unlock and fix warn.

This should fix issue DC-SWAT#136

Author: DC-SWAT

applications/iso_loader/modules/module.c

@@ -1522,7 +1522,6 @@ static void *selectFile_worker(void *p) {
 
  strncpy(self.filename, filename, NAME_MAX);
  trailer_path = relativeFilename("trailer.avi");
- mutex_unlock(&self.select_mutex);
 
  showCover();
  isoLoader_LoadPreset(NULL);
@@ -1649,7 +1648,7 @@ static int scanDirectoryForImage(const char *dir_path, const char *dir_name, cha
  int subdir_found = 0;
  int best_priority = IMG_PRIORITY_NONE;
  int same_priority_count = 0;
- dirent_t *dent;
+ const dirent_t *dent;
 
  result[0] = '\0';