perf bench uprobe: Fix potential use of memory after free

Found by clang-tidy:
```
bench/uprobe.c:98:3: warning: Use of memory after it is freed [clang-analyzer-unix.Malloc]
                bench_uprobe_bpf__destroy(skel);
```

Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: [email protected]
Cc: Ming Wang <[email protected]>
Cc: Tom Rix <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/perf/bench/uprobe.c b/tools/perf/bench/uprobe.c
index 914c0817fe8a..5c71fdc419dd 100644
--- a/tools/perf/bench/uprobe.c
+++ b/tools/perf/bench/uprobe.c
@@ -89,6 +89,7 @@ static int bench_uprobe__setup_bpf_skel(enum bench_uprobe bench)
 	return err;
 cleanup:
 	bench_uprobe_bpf__destroy(skel);
+	skel = NULL;
 	return err;
 }