MAINTAINERS: Update Olga Kornievskaia's email address

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

Author: chucklever

MAINTAINERS

@@ -11974,7 +11974,7 @@ KERNEL NFSD, SUNRPC, AND LOCKD SERVERS
 M:	Chuck Lever <chuck.lever@oracle.com>
 M:	Jeff Layton <jlayton@kernel.org>
 R:	Neil Brown <neilb@suse.de>
-R:	Olga Kornievskaia <kolga@netapp.com>
+R:	Olga Kornievskaia <okorniev@redhat.com>
 R:	Dai Ngo <Dai.Ngo@oracle.com>
 R:	Tom Talpey <tom@talpey.com>
 L:	linux-nfs@vger.kernel.org