wire-mix: duplicate word in comment

wire/msgmixciphertexts_test.go

@@ -18,7 +18,7 @@ import (
 // expectedSerializationCompare compares serialized bytes to the expected
 // sequence of bytes.  When got and expected are not equal, the test t will be
 // errored with descriptive messages of how the two encodings are different.
-// Returns true if the the serialization are equal, and false if the test
+// Returns true if the serialization are equal, and false if the test
 // errors.
 func expectedSerializationEqual(t *testing.T, got, expected []byte) bool {
 	if bytes.Equal(got, expected) {