emile_test_base64: Fix resource leak

Summary:
Coverity reports that we leak 'buffer' here so add a call to
eina_binbuf_free

Fixes CID1400820

@fix
Depends on D8779

Reviewers: raster, cedric, zmike, bu5hm4n, segfaultxavi

Reviewed By: segfaultxavi

Subscribers: segfaultxavi, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D8780

src/tests/emile/emile_test_base64.c

@@ -59,6 +59,8 @@ EFL_START_TEST(emile_test_base64_normal)
         eina_strbuf_reset(str);
      }
 
+   eina_binbuf_free(buffer);
+
    //Failure scenarios.
    decoded = emile_base64_decode(NULL);
    fail_if(decoded);