Avoid having to do CRC file calculation twice

libretro.c

@@ -231,13 +231,13 @@ static bool load_bios(const char *biosname)
    return true;
 }
 
-static bool load_cart(const char *file)
+static bool load_cart(const char *file, unsigned long crc_file)
 {
    FILE *fn;
    long l;
    int i, nb;
 
-   app_data.crc = crc32_file(file);
+   app_data.crc = crc_file;
    if (app_data.crc == 0xAFB23F89)
       app_data.exrom = 1;  /* Musician */
    if (app_data.crc == 0x3BFEF56B)
@@ -1027,18 +1027,18 @@ bool retro_load_game(const struct retro_game_info *info)
 
    init_audio();
 
-    app_data.crc = crc32_file(full_path);
+   crcx          = crc32_file(full_path);
+   app_data.crc  = crcx;
 
    //suck_bios();
    o2flag = 1;
 
-    crcx = app_data.crc;
    //suck_roms();
 
    if (!load_bios(bios_file_path))
       return false;
 
-    if (!load_cart(full_path))
+   if (!load_cart(full_path, crcx))
       return false;
 
 #ifdef HAVE_VOICE