sysctl: Fix mq permission check

The kernel test robot found a typo that causes mq_permissions() to return a
useless value.

Reported-by: kernel test robot <yujie.liu@intel.com>
Link: https://lore.kernel.org/r/202210052100.86dbb00a-yujie.liu@intel.com
Fixes: 7608b6a ("sysctl: Allow to change limits for posix messages queues")
Signed-off-by: Alexey Gladkov <legion@kernel.org>
Link: https://lkml.kernel.org/r/20221005170730.835761-1-legion@kernel.org
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

Author: legionus

ipc/mq_sysctl.c

@@ -102,7 +102,7 @@ static int mq_permissions(struct ctl_table_header *head, struct ctl_table *table
 	if (uid_eq(current_euid(), ns_root_uid))
 		mode >>= 6;
 
-	if (in_egroup_p(ns_root_gid))
+	else if (in_egroup_p(ns_root_gid))
 		mode >>= 3;
 
 	mode &= 7;