Hardcode numwords in vli_cmp
diff --git a/tinycrypt/ecc_dsa.c b/tinycrypt/ecc_dsa.c
index 1685c20..8cc09c7 100644
--- a/tinycrypt/ecc_dsa.c
+++ b/tinycrypt/ecc_dsa.c
@@ -121,7 +121,7 @@
 
 	/* Make sure 0 < k < curve_n */
   	if (uECC_vli_isZero(k) ||
-	    uECC_vli_cmp(curve->n, k, num_n_words) != 1) {
+	    uECC_vli_cmp(curve->n, k) != 1) {
 		return 0;
 	}