[PATCH v2] tools: bpftool: close va_list 'ap' by va_end()

From: gushengxian <redacted>

va_list 'ap' was opened but not closed by va_end(). It should be
closed by va_end() before return.

According to suggestion of Daniel Borkmann [off-list ref].
Signed-off-by: gushengxian <redacted>
---
 tools/bpf/bpftool/jit_disasm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/bpf/bpftool/jit_disasm.c b/tools/bpf/bpftool/jit_disasm.c
index e7e7eee9f172..24734f2249d6 100644
--- a/tools/bpf/bpftool/jit_disasm.c
+++ b/tools/bpf/bpftool/jit_disasm.c

@@ -43,11 +43,13 @@ static int fprintf_json(void *out, const char *fmt, ...)
 {
 	va_list ap;
 	char *s;
+	int err;
 
 	va_start(ap, fmt);
-	if (vasprintf(&s, fmt, ap) < 0)
-		return -1;
+	err = vasprintf(&s, fmt, ap);
 	va_end(ap);
+	if (err < 0)
+		return -1;
 
 	if (!oper_count) {
 		int i;

-- 
2.25.1