[COMMITTED 2.41] Fix tst-aarch64-pkey to handle ENOSPC as not supported

[Aurelien Jarno]

The syscall pkey_alloc can return ENOSPC to indicate either that all
keys are in use or that the system runs in a mode in which memory
protection keys are disabled. In such case the test should not fail and
just return unsupported.

This matches the behaviour of the generic tst-pkey.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
(cherry picked from commit 60f2d6be657aa8c663ee14bd266d343ae0f35afb)
---
 sysdeps/unix/sysv/linux/aarch64/tst-aarch64-pkey.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/aarch64/tst-aarch64-pkey.c b/sysdeps/unix/sysv/linux/aarch64/tst-aarch64-pkey.c
index 3ff33ef72a..c884efc3b4 100644
--- a/sysdeps/unix/sysv/linux/aarch64/tst-aarch64-pkey.c
+++ b/sysdeps/unix/sysv/linux/aarch64/tst-aarch64-pkey.c
@@ -55,6 +55,10 @@ do_test (void)
       if (errno == ENOSYS || errno == EINVAL)
         FAIL_UNSUPPORTED
           ("kernel or CPU does not support memory protection keys");
+      if (errno == ENOSPC)
+        FAIL_UNSUPPORTED
+          ("no keys available or kernel does not support memory"
+           " protection keys");
       FAIL_EXIT1 ("pkey_alloc: %m");
     }
 
-- 
2.45.2