selftests/bpf: Fix a compiler warning in global func test

mainline inclusion
from mainline-5.12-rc3
commit c41d81bf
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c41d81bfbb4579c3e583457e383dd63d026bf947

-------------------------------------------------

Add an explicit 'const void *' cast to pass program ctx pointer type into
a global function that expects pointer to structure.

warning: incompatible pointer types
passing 'struct __sk_buff *' to parameter of type 'const struct S *'
[-Wincompatible-pointer-types]
        return foo(skb);
                   ^~~
progs/test_global_func11.c:10:36: note: passing argument to parameter 's' here
__noinline int foo(const struct S *s)
                                   ^

Fixes: 8b08807d ("selftests/bpf: Add unit tests for pointers in global functions")
Signed-off-by: NDmitrii Banshchikov <me@ubique.spb.ru>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210223082211.302596-1-me@ubique.spb.ru
(cherry picked from commit c41d81bf)
Signed-off-by: NWang Yufen <wangyufen@huawei.com>

tools/testing/selftests/bpf/progs/test_global_func11.c

@@ -15,5 +15,5 @@ __noinline int foo(const struct S *s)
 SEC("cgroup_skb/ingress")
 int test_cls(struct __sk_buff *skb)
 {
-	return foo(skb);
+	return foo((const void *)skb);
 }