[media] pluto2: use KERN_CONT where needed

Some continuation messages are not using KERN_CONT.

Since commit 56387331 ("Merge branch 'printk-cleanups"),
this won't work as expected anymore. So, let's add KERN_CONT
to those lines.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/pci/pluto2/pluto2.c

@@ -577,12 +577,12 @@ static int pluto_read_serial(struct pluto *pluto)
 		for (j = 0; j < 32; j += 8) {
 			if ((val & 0xff) == 0xff)
 				goto out;
-			printk("%c", val & 0xff);
+			printk(KERN_CONT "%c", val & 0xff);
 			val >>= 8;
 		}
 	}
 out:
-	printk("\n");
+	printk(KERN_CONT "\n");
 	pci_iounmap(pdev, cis);
 
 	return 0;