declare loop variable at top of function body

Author: bigbrett

examples/benchmark/tls_bench.c

@@ -388,9 +388,10 @@ int DoneHandShake = 0;
 static int run_all_CAST(void)
 {
     int ret = 0;
+    int cast_idx = 0;
 
-    for (int i=0; i<FIPS_CAST_COUNT; i++) {
-        if ((ret = wc_RunCast_fips(i)) != 0) {
+    for (cast_idx=0; cast_idx<FIPS_CAST_COUNT; cast_idx++) {
+        if ((ret = wc_RunCast_fips(cast_idx)) != 0) {
 #ifdef NO_ERROR_STRINGS
             fprintf(stderr,
                     "ERROR: FIPS CAST failed with return code: %d\n", ret);