mariadbbackup: use defaults-group-suffix even if no --defaults-file

Signed-off-by: Daniel Black <daniel@linux.vnet.ibm.com>

extra/mariabackup/xtrabackup.cc

@@ -1223,8 +1223,8 @@ static int prepare_export()
   if (strncmp(orig_argv1,"--defaults-file=",16) == 0)
   {
     sprintf(cmdline, 
-     IF_WIN("\"","") "\"%s\" --mysqld \"%s\" --defaults-group-suffix=%s"
-      " --defaults-extra-file=./backup-my.cnf --datadir=."
+     IF_WIN("\"","") "\"%s\" --mysqld \"%s\" "
+      " --defaults-extra-file=./backup-my.cnf --defaults-group-suffix=%s --datadir=."
       " --innodb --innodb-fast-shutdown=0"
       " --innodb_purge_rseg_truncate_frequency=1 --innodb-buffer-pool-size=%llu"
       " --console  --skip-log-error --bootstrap  < "  BOOTSTRAP_FILENAME IF_WIN("\"",""),
@@ -1236,11 +1236,12 @@ static int prepare_export()
   {
     sprintf(cmdline,
      IF_WIN("\"","") "\"%s\" --mysqld"
-      " --defaults-file=./backup-my.cnf --datadir=."
+      " --defaults-file=./backup-my.cnf --defaults-group-suffix=%s --datadir=."
       " --innodb --innodb-fast-shutdown=0"
       " --innodb_purge_rseg_truncate_frequency=1 --innodb-buffer-pool-size=%llu"
       " --console  --log-error= --bootstrap  < "  BOOTSTRAP_FILENAME IF_WIN("\"",""),
       mariabackup_exe,
+      (my_defaults_group_suffix?my_defaults_group_suffix:""),
       xtrabackup_use_memory);
   }