MAINTAINERS: Remove net/core/flow.c

net/core/flow.c does not exist anymore, so remove it
from the IPSEC NETWORKING section of the MAINTAINERS
file.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index dcb0191..4ff21da 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10130,7 +10130,6 @@
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec.git
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next.git
 S:	Maintained
-F:	net/core/flow.c
 F:	net/xfrm/
 F:	net/key/
 F:	net/ipv4/xfrm*