ipp2p: fix Gnutella line ending detection

There is another mistake in the code. I have checked the Gnutella
protocol specification -- looks like the line separation is 0x0d-0x0a
and not 0x0a-0x0d (it seemed obvious but I was not sure and thought
they cannot have possibly got that wrong...). It would certainly
explain why I have never seen a match on any of my systems.

doc/changelog.txt

@@ -2,6 +2,7 @@
 HEAD
 ====
 - ipp2p: add more boundary checks
+- ipp2p: fix Gnutelle line ending detection
 
 
 Xtables-addons 1.19 (October 12 2009)

extensions/xt_ipp2p.c

@@ -586,8 +586,8 @@ search_all_gnu(const unsigned char *payload, const unsigned int plen)
 			unsigned int c;
 
 			for (c = 0; c < plen - 22; ++c)
-				if (payload[c] == 0x0a &&
-				    payload[c+1] == 0x0d &&
+				if (payload[c] == 0x0d &&
+				    payload[c+1] == 0x0a &&
 				    (memcmp(&payload[c+2], "X-Gnutella-", 11) == 0 ||
 				    memcmp(&payload[c+2], "X-Queue:", 8) == 0))
 					return IPP2P_GNU * 100 + 3;