staging: lustre: fix quotactl permission denied (LU-4530)

The changes introduced in commit 4b1a25f06b30b203 ("fix build when
CONFIG_UIDGID_STRICT_TYPE_CHECKS is on") got the UID check the wrong way
around, leading to "Permission denied" when a regular user attempts to
retrieve his quota (lfs quota -u ...) but allowing him to retrieve other
users quota.

Full details at: https://jira.hpdd.intel.com/browse/LU-4530

Cc: Peng Tao <[e-mail]>
Cc: <[e-mail]> # 3.12.x
Cc: <[e-mail]> # 3.13.x
Signed-off-by: Cédric Dufour <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/lustre/lustre/llite/dir.c

···
 		break;
 	case Q_GETQUOTA:
 		if (((type == USRQUOTA &&
-		      uid_eq(current_euid(), make_kuid(&init_user_ns, id))) ||
+		      !uid_eq(current_euid(), make_kuid(&init_user_ns, id))) ||
 		     (type == GRPQUOTA &&
 		      !in_egroup_p(make_kgid(&init_user_ns, id)))) &&
 		    (!cfs_capable(CFS_CAP_SYS_ADMIN) ||