Update src/tests.c

Co-authored-by: Tim Ruffing <[email protected]>

Author: sipa

src/tests.c

@@ -4355,7 +4355,7 @@ void ecmult_const_mult_xonly(void) {
     int i;
 
     /* Test correspondence between secp256k1_ecmult_const and secp256k1_ecmult_const_xonly. */
-    for (i = 0; i < 2*count; ++i) {
+    for (i = 0; i < 2*COUNT; ++i) {
         secp256k1_ge base;
         secp256k1_gej basej, resj;
         secp256k1_fe n, d, resx, v;