Put the variable declarations for TCPDEBUG under #ifdef INET as well.

The implementation already has this right.

Reviewed by:	rwatson

sys/netipx/spx_debug.c

@@ -82,11 +82,13 @@ __FBSDID("$FreeBSD$");
 #define	SANAMES
 #include <netipx/spx_debug.h>
 
+#ifdef INET
 #ifdef TCPDEBUG
 static	int spxconsdebug = 0;
 static	struct spx_debug spx_debug[SPX_NDEBUG];
 static	int spx_debx;
 #endif
+#endif
 
 /*
  * spx debug routines