net/ipv4: correct RFC 1122 section reference in comment

RFC 1122 does not have a section 3.1.2.2. The requirement to silently
discard datagrams with a bad checksum is in section 3.2.1.2 instead.

Addresses http://bugzilla.kernel.org/show_bug.cgi?id=10611

Signed-off-by: J.H.M. Dassen (Ray) <jdassen@debian.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 7b4bad6..ff77a4a 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -397,7 +397,7 @@
 	iph = ip_hdr(skb);
 
 	/*
-	 *	RFC1122: 3.1.2.2 MUST silently discard any IP frame that fails the checksum.
+	 *	RFC1122: 3.2.1.2 MUST silently discard any IP frame that fails the checksum.
 	 *
 	 *	Is the datagram acceptable?
 	 *