MDEV-26612 Two different ways to start MariaDB service can cause data corruption

RedHat systems have both files for lsb and init functions.
Old code was written as if/else, so second file (RedHat-specific) was not processed.
So, systemd redirect didn't work, because its logic is described in
RedHat-specific functions file

support-files/mysql.server.sh

@@ -91,16 +91,15 @@ datadir_set=
 
 #
 # Use LSB init script functions for printing messages, if possible
-#
+# Include non-LSB RedHat init functions to make systemctl redirect work
+init_functions="/etc/init.d/functions"
 lsb_functions="/lib/lsb/init-functions"
-if test -f $lsb_functions ; then
+if test -f $lsb_functions; then
   . $lsb_functions
-else
-  # Include non-LSB RedHat init functions to make systemctl redirect work
-  init_functions="/etc/init.d/functions"
-  if test -f $init_functions; then
-    . $init_functions
-  fi
+fi
+
+if test -f $init_functions; then
+  . $init_functions
   log_success_msg()
   {
     echo " SUCCESS! $@"