[PATCH v1] perf symbol: Avoid an undefined behavior warning

[Ian Rogers]

The node (nd) may be NULL and pointer arithmetic on NULL is undefined
behavior. Move the computation of next below the NULL check on the
node.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 tools/perf/util/symbol.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 3f36675b7c8f..5b54d2639df4 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -202,11 +202,10 @@ void symbols__fixup_duplicate(struct rb_root_cached *symbols)
 		curr = rb_entry(nd, struct symbol, rb_node);
 again:
 		nd = rb_next(&curr->rb_node);
-		next = rb_entry(nd, struct symbol, rb_node);
-
 		if (!nd)
 			break;
 
+		next = rb_entry(nd, struct symbol, rb_node);
 		if (curr->start != next->start)
 			continue;
 
-- 
2.42.0.459.ge4e396fd5e-goog