qtest: bios-tables-test: fix a memory leak

Fixes: 5da7c35e25a("bios-tables-test: Add Q35/TPM-TIS test")
Signed-off-by: Li Qiang <liq3ea@163.com>
Message-Id: <20200714153536.66060-1-liq3ea@163.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/qtest/bios-tables-test.c

@@ -924,6 +924,7 @@ static void test_acpi_tcg_tpm(const char *machine, const char *tpm_if,
     g_free(variant);
     g_free(tmp_path);
     g_free(tmp_dir_name);
+    g_free(args);
     free_test_data(&data);
 #else
     g_test_skip("TPM disabled");