free null cleanup finale

Don't check for NULL before calling OPENSSL_free

Reviewed-by: Richard Levitte <levitte@openssl.org>
diff --git a/test/evp_extra_test.c b/test/evp_extra_test.c
index 5641d98..ac79388 100644
--- a/test/evp_extra_test.c
+++ b/test/evp_extra_test.c
@@ -320,9 +320,7 @@
     EVP_MD_CTX_cleanup(&md_ctx);
     EVP_MD_CTX_cleanup(&md_ctx_verify);
     EVP_PKEY_free(pkey);
-    if (sig) {
-        OPENSSL_free(sig);
-    }
+    OPENSSL_free(sig);
 
     return ret;
 }