RS2 remove 40bit limit

src/ciphers/rc2.c

@@ -401,7 +401,7 @@ void rc2_done(symmetric_key *skey)
 int rc2_keysize(int *keysize)
 {
    LTC_ARGCHK(keysize != NULL);
-   if (*keysize < 5) {
+   if (*keysize < 1) {
        return CRYPT_INVALID_KEYSIZE;
    } else if (*keysize > 128) {
        *keysize = 128;