fix(test/tap): misleading-indentation bug fix + function-address bug + leak cleanup

test_ssl_fast_forward-1-t.cpp:
- Fix a bug I introduced in the prior batch: my scripted wrapping of
  braceless 'if (cond) return exit_status();' bodies skipped the one
  'if' line that had a trailing '// comment' (it didn't end with ')').
  The result was a misleading-indentation case where only close_all()
  was inside the if body and return exit_status() ran unconditionally.
  Added explicit { } around that block.

test_digest_umap_aux-t.cpp:
- Fix real logic bug: 'tests_failed == 0' (missing parentheses) compared
  the *address* of the function against zero. The address is never NULL,
  so the second operand of the '&&' was always false, and the
  TRUNCATE TABLE stats.stats_mysql_query_digest cleanup at end of main
  never actually ran. Fixed to 'tests_failed() == 0'. Surfaced by
  -Waddress.

test_default_conn_collation-t.cpp:
- Fix NULL-deref UB: mysql_init was not checked for NULL before being
  passed to mysql_real_connect.
- Fix 'admin' leak on mysql_real_connect failure.
- Remove the dead 'cleanup:' label: the label's cleanup code
  (mysql_close + return exit_status) was unreachable because the
  preceding happy-path flow was a plain fall-through into it. Moved
  the cleanup body inline and deleted the label.

Compile-verified with -fsyntax-only (-Wall for the first two files).

test/tap/tests/test_default_conn_collation-t.cpp

@@ -86,25 +86,28 @@ int check_all_collations(const CommandLine& cl, MYSQL* admin) {
 
 int main(int argc, char** argv) {
 	CommandLine cl;
+	MYSQL* admin = NULL;
 
 	if (cl.getEnv()) {
 		diag("Failed to get the required environmental variables.");
 		return EXIT_FAILURE;
 	}
 
-
-	MYSQL* admin = mysql_init(NULL);
+	admin = mysql_init(NULL);
+	if (!admin) {
+		fprintf(stderr, "File %s, line %d, Error: mysql_init failed for admin\n",
+			__FILE__, __LINE__);
+		return EXIT_FAILURE;
+	}
 
 	if (!mysql_real_connect(admin, cl.host, cl.admin_username, cl.admin_password, NULL, cl.admin_port, NULL, 0)) {
 		fprintf(stderr, "File %s, line %d, Error: %s\n", __FILE__, __LINE__, mysql_error(admin));
+		mysql_close(admin);
 		return EXIT_FAILURE;
 	}
 
 	check_all_collations(cl, admin);
 
-cleanup:
-
 	mysql_close(admin);
-
 	return exit_status();
 }

test/tap/tests/test_digest_umap_aux-t.cpp

@@ -315,7 +315,10 @@ int main(int argc, char** argv) {
 		);
 	}
 
-	if (tests_last() == nplan && tests_failed == 0) {
+	// Missing parentheses on tests_failed turned this into a comparison
+	// of the function's address against 0. The address is never NULL so
+	// the second operand was always false and the TRUNCATE was never run.
+	if (tests_last() == nplan && tests_failed() == 0) {
 		string q = "TRUNCATE TABLE stats.stats_mysql_query_digest";
 		diag("Running %s", q.c_str());
 		MYSQL_QUERY(proxy_admin, q.c_str());

test/tap/tests/test_ssl_fast_forward-1-t.cpp

@@ -244,9 +244,10 @@ int main(int argc, char** argv) {
 
 
 	diag("We now create a connection using SSL for both client or backend");
-	if (run_queries_sets(queries_set4, mysqladmin, "Running on Admin")) // note: we use queries_set4 again
+	if (run_queries_sets(queries_set4, mysqladmin, "Running on Admin")) { // note: we use queries_set4 again
 		close_all();
 		return exit_status();
+	}
 	mysqls[4] = mysql_init(NULL);
 	if (!mysqls[4]) {
 		close_all();