Avoid confusing messages caused by EIO on reading
/proc/sys/net/ipv6/conf/*/stable_secret if those are not set yet.
This is the same behaviour as in procps(>=3.3.13).

Signed-off-by: Yi Zhao <[email protected]>
---
 procps/sysctl.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/procps/sysctl.c b/procps/sysctl.c
index 6d77185ca..42c51cc91 100644
--- a/procps/sysctl.c
+++ b/procps/sysctl.c
@@ -202,7 +202,14 @@ static int sysctl_act_on_setting(char *setting)
                value = cptr = xmalloc_read(fd, NULL);
                close(fd);
                if (value == NULL) {
-                       bb_perror_msg("error reading key '%s'", outname);
+                       switch (errno) {
+                               case EIO:
+                                       /* Ignore stable_secret below 
/proc/sys/net/ipv6/conf */
+                                       break;
+                               default:
+                                       bb_perror_msg("error reading key '%s'", 
outname);
+                                       break;
+                       }
                        retval = EXIT_FAILURE;
                        goto end;
                }
-- 
2.17.1

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