crypto: nx - fix spelling mistake: "availavle" -> "available"

Trivial fix to spelling mistake in pr_err error message text. Also
fix spelling mistake in proceeding comment.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Acked-by: NHaren Myneni <haren@us.ibm.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/nx/nx-842-powernv.c

@@ -743,8 +743,8 @@ static int nx842_open_percpu_txwins(void)
 		}
 
 		if (!per_cpu(cpu_txwin, i)) {
-			/* shoudn't happen, Each chip will have NX engine */
-			pr_err("NX engine is not availavle for CPU %d\n", i);
+			/* shouldn't happen, Each chip will have NX engine */
+			pr_err("NX engine is not available for CPU %d\n", i);
 			return -EINVAL;
 		}
 	}