cgroup: Replace a seq_printf() call by seq_puts() in cgroup_print_ss_mask()

A string which did not contain a data format specification should be put
into a sequence. Thus use the corresponding function “seq_puts”.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/cgroup/cgroup.c

@@ -2894,7 +2894,7 @@ static void cgroup_print_ss_mask(struct seq_file *seq, u16 ss_mask)
 	do_each_subsys_mask(ss, ssid, ss_mask) {
 		if (printed)
 			seq_putc(seq, ' ');
-		seq_printf(seq, "%s", ss->name);
+		seq_puts(seq, ss->name);
 		printed = true;
 	} while_each_subsys_mask();
 	if (printed)