Update catfile.py

Author: Kazuki Suzuki Przyborowski

catfile.py

@@ -153,9 +153,9 @@ def handler(signum, frame):
     fnamehex = __file_format_hex__
 else:
     fnamemagic = fname
-    __file_format_default__ = fnamemagic
     fnamelen = len(fname)
     fnamehex = binascii.hexlify(fname.encode("UTF-8")).decode("UTF-8")
+__file_format_default__ = fnamemagic
 fnamesty = __use_new_style__
 fnamelst = __use_advanced_list__
 fnameino = __use_alt_inode__