Null termination of file name when max length

File names are returned unterminated in the edge case where their length
is max size This is due to the fact that strncpy does terminate the
destination string when the source string is greater than or equal to
the specifid maximum length.

libraries/Adafruit_LittleFS/src/Adafruit_LittleFS_File.cpp

@@ -37,6 +37,7 @@ File::File (Adafruit_LittleFS &fs)
   _fs = &fs;
   _is_dir = false;
   _name[0] = 0;
+  _name[LFS_NAME_MAX] = 0;
   _dir_path = NULL;
 
   _dir = NULL;