Add initialization for structures

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/tests/suites/test_suite_ecdh.function b/tests/suites/test_suite_ecdh.function
index e23b471..f52e5b8 100644
--- a/tests/suites/test_suite_ecdh.function
+++ b/tests/suites/test_suite_ecdh.function
@@ -50,6 +50,8 @@
     mbedtls_ecp_keypair kp;
     int invalid_side = 42;
 
+    mbedtls_ecp_keypair_init( &kp );
+
     TEST_EQUAL( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
                             mbedtls_ecdh_get_params( &ctx, &kp,
                                                      invalid_side ) );