netfilter: ipt_LOG/ip6t_LOG: remove comparison within loop

Remove the comparison within the loop to print the macheader by prepending
the colon to all but the first printk.

Based on suggestion by Jan Engelhardt <jengelh@medozas.de>.
Signed-off-by: Patrick McHardy <kaber@trash.net>

net/ipv4/netfilter/ipt_LOG.c

@@ -411,12 +411,12 @@ ipt_log_packet(u_int8_t pf,
 		    skb->mac_header != skb->network_header) {
 			int i;
 			const unsigned char *p = skb_mac_header(skb);
-			for (i = 0; i < skb->dev->hard_header_len; i++,p++)
-				printk("%02x%c", *p,
-				       i==skb->dev->hard_header_len - 1
-				       ? ' ':':');
-		} else
-			printk(" ");
+
+			printk("%02x", *p++);
+			for (i = 1; i < skb->dev->hard_header_len; i++, p++)
+				printk(":%02x", *p);
+		}
+		printk(" ");
 	}
 
 	dump_packet(loginfo, skb, 0);

net/ipv6/netfilter/ip6t_LOG.c

@@ -414,9 +414,9 @@ ip6t_log_packet(u_int8_t pf,
 				p = NULL;
 
 			if (p != NULL) {
-				for (i = 0; i < len; i++)
-					printk("%02x%s", p[i],
-					       i == len - 1 ? "" : ":");
+				printk("%02x", *p++);
+				for (i = 1; i < len; i++)
+					printk(":%02x", p[i]);
 			}
 			printk(" ");