Fixed HMAC_CTX_free invocation.

Author: vshabanov

cbits/HsOpenSSL.c

@@ -83,7 +83,7 @@ HMAC_CTX *HsOpenSSL_HMAC_CTX_new(void) {
 
 void HsOpenSSL_HMAC_CTX_free(HMAC_CTX *ctx) {
 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
- return HMAC_CTX_free();
+ HMAC_CTX_free(ctx);
 #else
  HMAC_CTX_cleanup(ctx);
  free(ctx);