Fix lint errors

utils/uint24.go

@@ -1,11 +1,15 @@
 package utils
 
+// Uint24 is a replacement for the absent Go uint24 data type.
+// This data type is little endian.
 type Uint24 [3]byte
 
+// ToUint24 converts number to Uint24.
 func ToUint24(number uint32) Uint24 {
 	return Uint24{byte(number), byte(number >> 8), byte(number >> 16)}
 }
 
+// FromUint24 converts Uint24 to number.
 func FromUint24(number Uint24) uint32 {
 	return uint32(number[0]) + (uint32(number[1]) << 8) + (uint32(number[2]) << 16)
 }