selftests/memfd: delete unused declarations

Commit 32d118ad50 ("selftests/memfd: add tests for F_SEAL_EXEC"):
- added several unused 'nbytes' local variables

Commit 6469b66e3f ("selftests: improve vm.memfd_noexec sysctl tests"):
- orphaned 'newpid_thread_fn2()' forward declaration
- orphaned 'join_newpid_thread()' forward declaration
- added unused 'pid' local in sysctl_simple_child()
- orphaned 'fd' local in sysctl_simple_child()
- added unused 'fd' in sysctl_nested_child()

Delete the unused locals and forward declarations.

Link: https://lkml.kernel.org/r/20240118095057.677544-1-gthelen@google.com
Signed-off-by: Greg Thelen <gthelen@google.com>
Cc: Aleksa Sarai <cyphar@cyphar.com>
Cc: Daniel Verkamp <dverkamp@chromium.org>
Cc: Jeff Xu <jeffxu@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

tools/testing/selftests/memfd/memfd_test.c

@@ -44,8 +44,6 @@
  */
 static size_t mfd_def_size = MFD_DEF_SIZE;
 static const char *memfd_str = MEMFD_STR;
-static int newpid_thread_fn2(void *arg);
-static void join_newpid_thread(pid_t pid);
 
 static ssize_t fd2name(int fd, char *buf, size_t bufsize)
 {
@@ -194,7 +192,6 @@ static unsigned int mfd_assert_get_seals(int fd)
 static void mfd_assert_has_seals(int fd, unsigned int seals)
 {
 	char buf[PATH_MAX];
-	int nbytes;
 	unsigned int s;
 	fd2name(fd, buf, PATH_MAX);
 
@@ -696,7 +693,6 @@ static void mfd_assert_mode(int fd, int mode)
 {
 	struct stat st;
 	char buf[PATH_MAX];
-	int nbytes;
 
 	fd2name(fd, buf, PATH_MAX);
 
@@ -715,7 +711,6 @@ static void mfd_assert_mode(int fd, int mode)
 static void mfd_assert_chmod(int fd, int mode)
 {
 	char buf[PATH_MAX];
-	int nbytes;
 
 	fd2name(fd, buf, PATH_MAX);
 
@@ -731,7 +726,6 @@ static void mfd_fail_chmod(int fd, int mode)
 {
 	struct stat st;
 	char buf[PATH_MAX];
-	int nbytes;
 
 	fd2name(fd, buf, PATH_MAX);
 
@@ -1254,9 +1248,6 @@ static void test_sysctl_set_sysctl2(void)
 
 static int sysctl_simple_child(void *arg)
 {
-	int fd;
-	int pid;
-
 	printf("%s sysctl 0\n", memfd_str);
 	test_sysctl_set_sysctl0();
 
@@ -1321,7 +1312,6 @@ static void test_sysctl_sysctl2_failset(void)
 
 static int sysctl_nested_child(void *arg)
 {
-	int fd;
 	int pid;
 
 	printf("%s nested sysctl 0\n", memfd_str);