[DCCP]: Introduce DCCP_{BUG{_ON},CRIT} macros, use enum:8 for the ccid3 states

This patch tackles the following problem:
       * the ccid3_hc_{t,r}x_sock define ccid3hc{t,r}x_state as `u8', but
         in reality there can only be a few, pre-defined enum names
       * this necessitates addiditional checking for unexpected values
         which would otherwise be caught by the compiler

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

net/dccp/dccp.h

@@ -18,6 +18,14 @@
 #include <net/tcp.h>
 #include "ackvec.h"
 
+#define DCCP_CRIT(fmt, a...) LIMIT_NETDEBUG(KERN_CRIT fmt " at %s:%d/%s()\n",  \
+ 					 ##a, __FILE__, __LINE__, __FUNCTION__)
+#define DCCP_BUG(fmt, a...)  do { DCCP_CRIT(fmt, ##a); dump_stack(); } while (0)
+#define DCCP_BUG_ON(cond)    do { if (unlikely((cond) == 0))                   \
+					DCCP_BUG("BUG: condition \"%s\" fails",\
+						 __stringify((cond)));	       \
+			     } while (0)
+
 #ifdef CONFIG_IP_DCCP_DEBUG
 extern int dccp_debug;