[openwrt/openwrt] umdns: add missing syscall to seccomp filter

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/db639238f202ef7a71ad7f85693463fd8a3810cd

commit db639238f202ef7a71ad7f85693463fd8a3810cd
Author: Michael Peleshenko <mpeleshenko at gmail.com>
AuthorDate: Mon Oct 25 20:12:57 2021 -0400

    umdns: add missing syscall to seccomp filter
    
    The 'madvise', syscall is missing.
    Found with 'utrace /usr/sbin/umdns' on an R7800 and RT3200.
    
    Signed-off-by: Michael Peleshenko <mpeleshenko at gmail.com>
---
 package/network/services/umdns/files/umdns.json | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/network/services/umdns/files/umdns.json b/package/network/services/umdns/files/umdns.json
index e941b223a8..92f1a17b52 100644
--- a/package/network/services/umdns/files/umdns.json
+++ b/package/network/services/umdns/files/umdns.json
@@ -21,6 +21,7 @@
 				"fstat",
 				"getsockname",
 				"ioctl",
+				"madvise",
 				"mmap",
 				"mmap2",
 				"munmap",