busybox: sysctl: ignore EIO of stable_secret below /proc/sys/net/ipv6/conf

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

Fixes:
$ sysctl -a | grep ipv6.conf | grep stable_secret
sysctl: error reading key 'net.ipv6.conf.all.stable_secret': Input/output error
sysctl: error reading key 'net.ipv6.conf.default.stable_secret': Input/output error
sysctl: error reading key 'net.ipv6.conf.eth0.stable_secret': Input/output error
sysctl: error reading key 'net.ipv6.conf.lo.stable_secret': Input/output error

(From OE-Core rev: ff074f495dd4bb637618f790dd30e51e542cd30a)

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/meta/recipes-core/busybox/busybox_1.31.1.bb b/meta/recipes-core/busybox/busybox_1.31.1.bb
index ec5b580442..2bb1d59ba7 100644
--- a/meta/recipes-core/busybox/busybox_1.31.1.bb
+++ b/meta/recipes-core/busybox/busybox_1.31.1.bb
@@ -47,6 +47,7 @@ SRC_URI = "https://busybox.net/downloads/busybox-${PV}.tar.bz2;name=tarball \
            file://0003-runsv-Use-64-prefix-syscall-if-we-have-to.patch \
            file://0001-Remove-syscall-wrappers-around-clock_gettime-closes-.patch \
            file://0001-Remove-stime-function-calls.patch \
+           file://0001-sysctl-ignore-EIO-of-stable_secret-below-proc-sys-ne.patch \
 "
 SRC_URI_append_libc-musl = " file://musl.cfg "