MAINTAINERS: update PPP OVER L2TP file patterns

Commit 21b4aaa14329db793832e865f15000c5c0192ac3 ("l2tp: Relocate pppol2tp
driver to new net/l2tp directory") moved the file.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6ec1090..048cbfa 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4531,7 +4531,7 @@
 PPP OVER L2TP
 M:	James Chapman <jchapman@katalix.com>
 S:	Maintained
-F:	drivers/net/pppol2tp.c
+F:	net/l2tp/l2tp_ppp.c
 F:	include/linux/if_pppol2tp.h
 
 PPS SUPPORT