fix: make the macro BUG() in FreeBSD same as linux.

In FreeBSD, BUG() only print the error message without print the registers and stack trace and kill the process.
So there should be a error panic

Close #I3NHA8

sys/compat/linuxkpi/common/include/linux/kernel.h

@@ -139,7 +139,7 @@ extern "C" {
 #endif
 
 #define BUG() do { \
-        diag_printf("BUG() at %s %d\n", __FUNCTION__, __LINE__); \
+        panic("BUG() at %s %d\n", __FUNCTION__, __LINE__); \
 } while (0)
 
 #define BUG_ON(condition) do {  \