nvme-fabrics: Use seq_putc() in __nvmf_concat_opt_tokens()

Single characters should be put into a sequence.
Thus use the corresponding function “seq_putc”.

This issue was transformed by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Keith Busch <kbusch@kernel.org>

drivers/nvme/host/fabrics.c

@@ -1403,10 +1403,10 @@ static void __nvmf_concat_opt_tokens(struct seq_file *seq_file)
 		tok = &opt_tokens[idx];
 		if (tok->token == NVMF_OPT_ERR)
 			continue;
-		seq_puts(seq_file, ",");
+		seq_putc(seq_file, ',');
 		seq_puts(seq_file, tok->pattern);
 	}
-	seq_puts(seq_file, "\n");
+	seq_putc(seq_file, '\n');
 }
 
 static int nvmf_dev_show(struct seq_file *seq_file, void *private)