Merge pull request #4678 from JoeSubbiani/FixedMissingContextFree-test_suite_aes

Backport 2.x: Add missing free context at the end of aes_crypt_xts_size()

ChangeLog.d/issue4176.txt

@@ -0,0 +1,3 @@
+Bugfix
+   * Fix a resource leak in a test suite with an alternative AES
+     implementation. Fixes #4176.

tests/suites/test_suite_aes.function

@@ -210,6 +210,8 @@ void aes_crypt_xts_size( int size, int retval )
     /* Valid pointers are passed for builds with MBEDTLS_CHECK_PARAMS, as
      * otherwise we wouldn't get to the size check we're interested in. */
     TEST_ASSERT( mbedtls_aes_crypt_xts( &ctx, MBEDTLS_AES_ENCRYPT, length, data_unit, src, output ) == retval );
+exit:
+    mbedtls_aes_xts_free( &ctx );
 }
 /* END_CASE */