powerpc/4xx: Use seq_putc() in ocm_debugfs_show()

A single character (line break) should be put into a sequence.
Thus use the corresponding function "seq_putc".

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/4xx/ocm.c

@@ -264,7 +264,7 @@ static int ocm_debugfs_show(struct seq_file *m, void *v)
 						blk->size, blk->owner);
 		}
 
-		seq_printf(m, "\n");
+		seq_putc(m, '\n');
 	}
 
 	return 0;