selftests/nolibc: drop test chmod_net

The test relies on /proc/$PID/net to allow chmod() operations.
It is the only file or directory in /proc/$PID/ to allow this and a bug.
That bug will be fixed in the next patch in the series and therefore
the test would start failing.

Link: https://lore.kernel.org/lkml/[email protected]/
Signed-off-by: Thomas Weißschuh <[email protected]>
Fixes: b4844fa ("selftests/nolibc: implement a few tests for various syscalls")
Tested-by: Zhangjin Wu <[email protected]>
Signed-off-by: Willy Tarreau <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

Author: t-8ch

tools/testing/selftests/nolibc/nolibc-test.c

@@ -577,7 +577,6 @@ int run_syscall(int min, int max)
 		CASE_TEST(chdir_root);        EXPECT_SYSZR(1, chdir("/")); break;
 		CASE_TEST(chdir_dot);         EXPECT_SYSZR(1, chdir(".")); break;
 		CASE_TEST(chdir_blah);        EXPECT_SYSER(1, chdir("/blah"), -1, ENOENT); break;
-		CASE_TEST(chmod_net);         EXPECT_SYSZR(proc, chmod("/proc/self/net", 0555)); break;
 		CASE_TEST(chmod_self);        EXPECT_SYSER(proc, chmod("/proc/self", 0555), -1, EPERM); break;
 		CASE_TEST(chown_self);        EXPECT_SYSER(proc, chown("/proc/self", 0, 0), -1, EPERM); break;
 		CASE_TEST(chroot_root);       EXPECT_SYSZR(euid0, chroot("/")); break;