Clean the following coccicheck warning:

./kernel/trace/bpf_trace.c:2263:34-35: WARNING opportunity for swap().
./kernel/trace/bpf_trace.c:2264:40-41: WARNING opportunity for swap().

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
---
 kernel/trace/bpf_trace.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 0009104dca82..36e0f459d152 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2253,15 +2253,13 @@ static void bpf_kprobe_multi_cookie_swap(void *a, void *b, int size, const void
 	const struct bpf_kprobe_multi_link *link = priv;
 	unsigned long *addr_a = a, *addr_b = b;
 	u64 *cookie_a, *cookie_b;
-	unsigned long tmp1;
-	u64 tmp2;
 
 	cookie_a = link->cookies + (addr_a - link->addrs);
 	cookie_b = link->cookies + (addr_b - link->addrs);
 
 	/* swap addr_a/addr_b and cookie_a/cookie_b values */
-	tmp1 = *addr_a; *addr_a = *addr_b; *addr_b = tmp1;
-	tmp2 = *cookie_a; *cookie_a = *cookie_b; *cookie_b = tmp2;
+	swap(*addr_a, *addr_b);
+	swap(*cookie_a, *cookie_b);
 }
 
 static int __bpf_kprobe_multi_cookie_cmp(const void *a, const void *b)
-- 
2.20.1.7.g153144c

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@iogearbox.net>:

On Tue, 22 Mar 2022 14:21:49 +0800 you wrote:
> Clean the following coccicheck warning:
> 
> ./kernel/trace/bpf_trace.c:2263:34-35: WARNING opportunity for swap().
> ./kernel/trace/bpf_trace.c:2264:40-41: WARNING opportunity for swap().
> 
> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
> 
> [...]

Here is the summary with links:
  - bpf: Use swap() instead of open coding it
    https://git.kernel.org/bpf/bpf-next/c/11e17ae42377

You are awesome, thank you!
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