Correct definition of ENTROPY_HAVE_STRONG
Mbed TLS 2.1 doesn't have MBEDTLS_TEST_NULL_ENTROPY macro.
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index b80831e..5c20f81 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -59,11 +59,10 @@
/* Indicates whether we expect mbedtls_entropy_init
* to initialize some strong entropy source. */
-#if defined(MBEDTLS_TEST_NULL_ENTROPY) || \
- ( !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES) && \
- ( !defined(MBEDTLS_NO_PLATFORM_ENTROPY) || \
- defined(MBEDTLS_HAVEGE_C) || \
- defined(MBEDTLS_ENTROPY_HARDWARE_ALT) ) )
+#if !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES) && \
+ ( !defined(MBEDTLS_NO_PLATFORM_ENTROPY) || \
+ defined(MBEDTLS_HAVEGE_C) || \
+ defined(MBEDTLS_ENTROPY_HARDWARE_ALT) )
#define ENTROPY_HAVE_STRONG
#endif