kernel/trace/bpf_trace.c: work around gcc-4.4.4 anon union initialization bug

kernel/trace/bpf_trace.c: In function 'bpf_event_output':
kernel/trace/bpf_trace.c:312: error: unknown field 'next' specified in initializer
kernel/trace/bpf_trace.c:312: warning: missing braces around initializer
kernel/trace/bpf_trace.c:312: warning: (near initialization for 'raw.frag.<anonymous>')

Fixes: 555c8a8 ("bpf: avoid stack copy and use skb ctx for event output")
Acked-by: Daniel Borkmann <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: David S. Miller <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Acked-by: Alexei Starovoitov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: akpm00

kernel/trace/bpf_trace.c

@@ -309,7 +309,9 @@ u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
 	};
 	struct perf_raw_record raw = {
 		.frag = {
-			.next	= ctx_size ? &frag : NULL,
+			{
+				.next	= ctx_size ? &frag : NULL,
+			},
 			.size	= meta_size,
 			.data	= meta,
 		},