SLIP0010: fix different expressions for resulting child key (#296)

slip-0010.md

@@ -92,7 +92,7 @@ The function CKDpriv((k<sub>par</sub>, c<sub>par</sub>), i) &rarr; (k<sub>i</sub
 2. Split I into two 32-byte sequences, I<sub>L</sub> and I<sub>R</sub>.
 3. The returned chain code c<sub>i</sub> is I<sub>R</sub>.
 4. If curve is ed25519: The returned child key k<sub>i</sub> is parse<sub>256</sub>(I<sub>L</sub>).
-5. If parse<sub>256</sub>(I<sub>L</sub>) ≥ n or parse<sub>256</sub>(I<sub>L</sub>) + k<sub>par</sub> = 0 (resulting key is invalid):
+5. If parse<sub>256</sub>(I<sub>L</sub>) ≥ n or parse<sub>256</sub>(I<sub>L</sub>) + k<sub>par</sub> (mod n) = 0 (resulting key is invalid):
     * let I = HMAC-SHA512(Key = c<sub>par</sub>, Data = 0x01 || I<sub>R</sub> || ser<sub>32</sub>(i) and restart at step 2.
 6. Otherwise: The returned child key k<sub>i</sub> is parse<sub>256</sub>(I<sub>L</sub>) + k<sub>par</sub> (mod n).