adjust comment

weed/storage/needle/needle.go

@@ -31,9 +31,9 @@ type Needle struct {
 	Data         []byte `comment:"The actual file data"`
 	Flags        byte   `comment:"boolean flags"` //version2
 	NameSize     uint8  //version2
-	Name         []byte `comment:"maximum 256 characters"` //version2
+	Name         []byte `comment:"maximum 255 characters"` //version2
 	MimeSize     uint8  //version2
-	Mime         []byte `comment:"maximum 256 characters"` //version2
+	Mime         []byte `comment:"maximum 255 characters"` //version2
 	PairsSize    uint16 //version2
 	Pairs        []byte `comment:"additional name value pairs, json format, maximum 64kB"`
 	LastModified uint64 //only store LastModifiedBytesLength bytes, which is 5 bytes to disk