MDEV-31925 Fix for File Leak in mysql_upgrade with --check-if-upgrade-is-needed Option

This commit addresses the file leakage problem encountered with the mysql_upgrade --check-if-upgrade-is-needed command.

client/mysql_upgrade.c

@@ -1374,7 +1374,12 @@ int main(int argc, char **argv)
   open_mysql_upgrade_file();
 
   if (opt_check_upgrade)
-    exit(upgrade_already_done(0) == 0);
+  {
+    int upgrade_needed = upgrade_already_done(0);
+    free_used_memory();
+    my_end(my_end_arg);
+    exit(upgrade_needed == 0);
+  }
 
   /* Find mysqlcheck */
   find_tool(mysqlcheck_path, IF_WIN("mysqlcheck.exe", "mysqlcheck"), self_name);

mysql-test/main/mysql_upgrade_file_leak.result

@@ -0,0 +1,4 @@
+Running mysql_upgrade with --check-if-upgrade-is-needed
+Checking for absence of temporary files by mysql_upgrade
+No temporary files found
+End of 10.4 tests

mysql-test/main/mysql_upgrade_file_leak.test

@@ -0,0 +1,24 @@
+-- source include/mysql_upgrade_preparation.inc
+
+#
+# MDEV-31925 mysqld_upgrade --check-if-upgrade-is-needed leaks files
+#
+
+# Run mysql_upgrade with --check-if-upgrade-is-needed
+--echo Running mysql_upgrade with --check-if-upgrade-is-needed
+--exec $MYSQL_UPGRADE --check-if-upgrade-is-needed 2>&1
+
+# Check if temporary files related to mysql_upgrade are cleared
+--echo Checking for absence of temporary files by mysql_upgrade
+--perl
+
+# Use the temporary directory path from the MySQL configuration
+my $tmpdir = "$ENV{MYSQL_TMP_DIR}";
+
+die "Test failed: Found temporary file left by mysql_upgrade\n" if (glob("$tmpdir/mysql_upgrade-*"));
+print "No temporary files found\n";
+EOF
+
+let $MYSQLD_DATADIR= `select @@datadir`;
+--remove_file $MYSQLD_DATADIR/mysql_upgrade_info
+--echo End of 10.4 tests