[PATCH nft 2/5] utils: call abort() after BUG() macro

[Thomas Haller <thaller@redhat.com>]

Otherwise, we get spurious warnings. The compiler should be aware that there is
no return from BUG(). Call abort() there, which is marked as __attribute__
((__noreturn__)).

    In file included from ./include/nftables.h:6,
                     from ./include/rule.h:4,
                     from src/payload.c:26:
    src/payload.c: In function 'icmp_dep_to_type':
    ./include/utils.h:39:34: error: this statement may fall through [-Werror=implicit-fallthrough=]
       39 | #define BUG(fmt, arg...)        ({ fprintf(stderr, "BUG: " fmt, ##arg); assert(0); })
          |                                 ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    src/payload.c:791:17: note: in expansion of macro 'BUG'
      791 |                 BUG("Invalid map for simple dependency");
          |                 ^~~
    src/payload.c:792:9: note: here
      792 |         case PROTO_ICMP_ECHO: return ICMP_ECHO;
          |         ^~~~

Signed-off-by: Thomas Haller <thaller@redhat.com>
---
 include/utils.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/utils.h b/include/utils.h
index efc8dec013a1..5b8b181c1e99 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -3,6 +3,7 @@
 
 #include <asm/byteorder.h>
 #include <stdarg.h>
+#include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <assert.h>
@@ -36,7 +37,7 @@
 #define __must_check		__attribute__((warn_unused_result))
 #define __noreturn		__attribute__((__noreturn__))
 
-#define BUG(fmt, arg...)	({ fprintf(stderr, "BUG: " fmt, ##arg); assert(0); })
+#define BUG(fmt, arg...)	({ fprintf(stderr, "BUG: " fmt, ##arg); assert(0); abort(); })
 
 #define BUILD_BUG_ON(condition)	((void)sizeof(char[1 - 2*!!(condition)]))
 #define BUILD_BUG_ON_ZERO(e)	(sizeof(char[1 - 2 * !!(e)]) - 1)
-- 
2.41.0