[PATCH] tst-atexit-common.c: Mark _exit_with_flush as noreturn

[H.J. Lu]

Mark _exit_with_flush as noreturn to silence the Clang error on
tst-atexit-common.c:

In file included from tst-atexit.c:22:
../stdlib/tst-atexit-common.c:113:5: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
  113 |     case 0:  /* Child.  */
      |     ^
../stdlib/tst-atexit-common.c:113:5: note: insert 'break;' to avoid fall-through
  113 |     case 0:  /* Child.  */
      |     ^
      |     break;
1 error generated.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
---
 stdlib/tst-atexit-common.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/stdlib/tst-atexit-common.c b/stdlib/tst-atexit-common.c
index 4bea464b19..f77ccbbd0d 100644
--- a/stdlib/tst-atexit-common.c
+++ b/stdlib/tst-atexit-common.c
@@ -37,6 +37,7 @@ static char crumbs[sizeof (expected)];
 static int next_slot = 0;
 
 /* Helper: flush stdout and _exit.  */
+__attribute__ ((__noreturn__))
 static void
 _exit_with_flush (int code)
 {
-- 
2.47.1