Organize debug code.

src/xdpfw_kern.c

@@ -23,14 +23,12 @@
 #define ALLOWSINGLEIPV4V6 // When this is defined, a check will occur inside the IPv4 and IPv6 filters. For IPv6 packets, if no IPv6 source/destination IP addresses are set, but there is an IPv4 address, it will ignore the filter. The same goes for IPv4, if there is no IPv4 source/destination IP addresses set, if an IPv6 address is set, it will ignore the filter.
 
 #ifdef DEBUG
-
 #define bpf_printk(fmt, ...)					\
 ({								\
 	       char ____fmt[] = fmt;				\
 	       bpf_trace_printk(____fmt, sizeof(____fmt),	\
 				##__VA_ARGS__);			\
 })
-
 #endif
 
 struct bpf_map_def SEC("maps") filters_map =